St. Louis Weather Radio: Stations, Frequencies, SAME Codes

NOAA Weather Radio All Hazards broadcasts 24 hours a day on seven dedicated frequencies between 162.400 and 162.550 MHz, but knowing which transmitter serves St. Louis and which 6-digit S.A.M.E. code to program for your specific county is what separates a useful alert radio from one that wakes you up for storms 200 miles away.

This guide covers every St. Louis-area NWR transmitter, its broadcast frequency, signal footprint, and the exact S.A.M.E. codes for St. Louis City, St. Louis County, and every surrounding Missouri and Illinois county within the metro listening area.

What Is NOAA Weather Radio and Why St. Louis Residents Need It

NOAA Weather Radio All Hazards (NWR) is a nationwide network of radio transmitters operated by the National Weather Service, broadcasting continuous weather information and emergency alerts on seven VHF frequencies between 162.400 and 162.550 MHz. According to NOAA, the NWR network covers approximately 95% of the United States population within reception range of at least one transmitter.

St. Louis sits at the intersection of major tornado corridors in the central Mississippi River Valley. The region averages several significant severe weather events each year, including tornadoes, flash floods, ice storms, and summer heat emergencies.

A standard FM or AM radio does not receive NWR broadcasts. You need a dedicated NOAA weather alert radio capable of receiving VHF frequencies in the 162 MHz range.

Without S.A.M.E. (Specific Area Message Encoding) technology programmed to your county, your radio will trigger an alarm for every alert issued anywhere in the NWR transmitter’s broadcast area, which can span dozens of counties across multiple states.

S.A.M.E. is a digital encoding system that precedes each alert broadcast with a coded header identifying the affected counties, alert type, and duration. A weather radio with S.A.M.E. filtering activated will only sound its alarm when the broadcast header matches the county codes you have pre-programmed into the device.

The practical difference is significant: without S.A.M.E. filtering, a St. Louis City resident’s radio will alarm for tornado warnings in rural southern Illinois counties that are 150 miles away and irrelevant to their safety.

If you are new to how this system works at a technical level, our overview of how the NOAA Weather Radio All Hazards network functions explains the broadcast infrastructure and alert types in detail.

The bottom line: every St. Louis-area household should own a S.A.M.E.-capable weather radio programmed to their specific county code, positioned near a sleeping area, and connected to a battery backup power source.

St. Louis NOAA Weather Radio Stations and Broadcast Frequencies

The St. Louis metropolitan area is served primarily by two NWR transmitters: WXL58 in St. Louis, Missouri, and WXK49 in Carlinville, Illinois. Both broadcast on separate frequencies and cover overlapping portions of the metro area from different directions.

Reception quality depends on your location within the metro, the transmitter’s power output, your antenna placement, and physical obstructions such as buildings and terrain.

WXL58 St. Louis, Missouri

WXL58 is the primary NWR transmitter for the St. Louis metropolitan area, broadcasting from St. Louis, Missouri. This station is the go-to signal source for most residents of St. Louis City, St. Louis County, and the Missouri-side suburbs.

Key specifications for WXL58:

• Broadcast frequency: 162.550 MHz (WX1)
• Call sign: WXL58
• Location: St. Louis, Missouri
• Primary coverage: St. Louis City, St. Louis County, Jefferson County, Franklin County, St. Charles County (Missouri side)
• NWS office: NWS St. Louis (LSX)

162.550 MHz is the most widely used NWR frequency in the country, designated as WX1 on most consumer weather radios. If your radio has a single-button WX scan, it will typically land on this frequency first when signal is present.

Residents on the Missouri side of the metro, from downtown St. Louis through Clayton, Kirkwood, Chesterfield, and St. Peters, should program 162.550 MHz as their primary channel.

WXK49 Carlinville, Illinois

WXK49 in Carlinville, Illinois, serves the Illinois portion of the St. Louis metro area and provides a secondary signal source for residents on the eastern side of the Mississippi River. This transmitter is the primary source for Madison County, St. Clair County, Monroe County, and adjacent Illinois counties in the Metro East region.

Key specifications for WXK49:

• Broadcast frequency: 162.400 MHz (WX2)
• Call sign: WXK49
• Location: Carlinville, Illinois
• Primary coverage: Madison County, St. Clair County, Monroe County, Jersey County, Macoupin County, Bond County, Montgomery County, Fayette County (Illinois side)
• NWS office: NWS St. Louis (LSX) and NWS Lincoln (ILX) depending on county

162.400 MHz is designated WX2 on most consumer radios. Residents in Belleville, Edwardsville, Collinsville, O’Fallon (IL), and other Metro East communities typically receive a stronger, more reliable signal from WXK49 than from WXL58.

If you live in the Metro East area of Illinois, program 162.400 MHz as your primary channel and use S.A.M.E. codes specific to Illinois counties.

Additional Regional Transmitters Reaching the St. Louis Area

Several other NWR transmitters within 75-100 miles of St. Louis may provide fringe reception in portions of the metro area, particularly in outlying counties. These are secondary options and should not replace the two primary stations above.

Use the table below to identify which transmitter and frequency is most relevant to your location.

For a complete listing of every NWR transmitter in Missouri and Illinois, including power output and precise coverage maps, our guide to NOAA Weather Radio transmitters organized by state provides the full database.

The best way to identify your strongest local signal is to let your weather radio scan all seven NWR frequencies (162.400, 162.425, 162.450, 162.475, 162.500, 162.525, 162.550 MHz) and observe which channel produces the cleanest, most consistent reception at your location.

Here is the full St. Louis-area SAME code reference you can use to program your weather radio for county-specific alerts.

How S.A.M.E. Codes Work and Why Your County Code Is the Most Important Setting

S.A.M.E. (Specific Area Message Encoding) is a digital protocol, specified by the National Weather Service, that embeds a structured data header at the beginning of every NWR alert broadcast. This header contains the originating NWS office, the event type (such as Tornado Warning or Flash Flood Watch), the affected FIPS county codes, the alert duration, and the issue time.

Your weather radio’s S.A.M.E. decoder chip reads this header in real time and compares it against the county codes you have programmed into the device’s memory.

This comparison happens because the radio’s microprocessor continuously monitors the NWR carrier signal for the 1050 Hz attention tone that precedes every alert header. When that tone is detected, the decoder activates and reads the digital burst that follows.

This filtering only works when you have programmed at least one valid 6-digit FIPS S.A.M.E. code into your radio. Without a programmed code, the radio operates in “all hazards” mode and alarms for every alert regardless of geography.

If you program the wrong county code, the result is either complete silence during a genuine local emergency (if your county is not in the broadcast’s header) or false alarms for counties you do not live in. Fix it by verifying your exact 6-digit code against the NOAA NWR county code database and re-entering it through your radio’s programming menu.

Most S.A.M.E. weather alert radios allow you to store between 1 and 25 county codes simultaneously. If you live near a county boundary or spend time in multiple counties regularly (such as for work or a second property), programming multiple county codes ensures you receive alerts relevant to all of those locations.

The technical detail of S.A.M.E. encoding, including the full list of event codes and how the header is structured, is covered in depth in our dedicated guide on how S.A.M.E. technology filters weather radio alerts by county.

Programming your correct county S.A.M.E. code is the single most impactful configuration step you can take on any weather radio, and it takes less than two minutes on most devices.

How to Program S.A.M.E. Codes on Common St. Louis-Area Weather Radios

Programming S.A.M.E. codes differs by radio model, but the underlying process is the same on all devices: enter programming mode, navigate to the S.A.M.E. or county code menu, enter your 6-digit FIPS code digit by digit, and confirm the entry. The entire process takes 2-5 minutes on most consumer radios.

The most commonly owned weather radios in the St. Louis market are the Midland WR400, the Uniden BC365CRS, and the Midland WR120.

Programming the Midland WR400 for St. Louis County (S.A.M.E. Code 029189)

1. Power on the WR400 and press the PROG button to enter programming mode.
2. Use the up/down arrows to navigate to SAME COUNTY and press ENTER.
3. Select COUNTY 1 (or the next available slot) and press ENTER.
4. Enter the 6-digit code 0 2 9 1 8 9 using the number pad, one digit at a time.
5. Press ENTER to confirm. The display will show the code stored.
6. Repeat steps 3-5 for any additional county codes you want to monitor.
7. Press PROG again to exit programming mode and return to normal monitoring.

The WR400 stores up to 50 S.A.M.E. location codes, which is more than enough for residents who travel across multiple Missouri and Illinois counties regularly.

Programming the Uniden BC365CRS for St. Louis City (S.A.M.E. Code 029510)

1. Press and hold the MENU button until the display shows the setup menu.
2. Use the scroll wheel to navigate to SAME SETUP and press MENU to select.
3. Choose PROGRAM and select LOCATION 1 (or the next open slot).
4. Use the scroll wheel to enter each digit of 0 2 9 5 1 0, pressing MENU after each digit.
5. After the 6th digit is confirmed, press MENU to save the code.
6. Press SCAN to return to normal weather monitoring mode.

The BC365CRS supports up to 25 programmable S.A.M.E. location codes and also allows alert type filtering, letting you disable alert categories you do not want to be woken for (such as administrative test broadcasts).

Programming the Midland WR120 (Budget Option)

1. Press the PROG/SNOOZE button once to enter S.A.M.E. programming mode.
2. The display will show COUNTY 1. Press PROG/SNOOZE again to begin entering digits.
3. Use the + and – buttons to cycle to each correct digit, pressing PROG/SNOOZE to advance.
4. Enter 0 2 9 1 8 9 for St. Louis County (or your specific county code).
5. After the 6th digit, the radio returns to the county selection screen. Press CLOCK/WX to exit.

The WR120 stores up to 25 S.A.M.E. codes despite being one of the most affordable S.A.M.E.-capable weather radios available, typically priced between $25 and $40.

Correctly programming your S.A.M.E. county code and verifying the radio responds only to your county’s alerts is the entire goal of this setup process.

Which Weather Radio Should St. Louis Residents Buy

The best weather radio for St. Louis-area residents is one that receives 162.550 MHz (WXL58) or 162.400 MHz (WXK49) reliably, supports S.A.M.E. county code programming, has a battery backup power source, and produces an alarm loud enough to wake you from sleep. Any radio that meets these four criteria will protect you effectively.

The main decision points are: how many S.A.M.E. codes you need to store, whether you want alert type filtering (to suppress test broadcasts overnight), and whether you need a portable hand-crank option for power outages during severe storms.

Best Overall: Midland WR400

The Midland WR400 is the most capable consumer weather radio available under $60 and the most commonly recommended option for St. Louis households.

Key Specifications:

• Frequency: 162.400-162.550 MHz (all 7 NWR channels)
• S.A.M.E. codes: stores up to 50 programmable county codes
• Alert types: 25 programmable EAS alert categories
• Power: AC adapter with 6x AA battery backup
• Alarm output: 90 dB siren
• Price range: $50-$65

The ability to suppress specific alert types (for example, disabling Child Abduction Emergency alerts overnight while keeping Tornado Warnings active) makes the WR400 significantly more livable as a 24-hour monitoring device than budget models without this feature.

Best Budget Option: Midland WR120

The Midland WR120 covers all 7 NWR frequencies, supports up to 25 S.A.M.E. codes, and retails for $25-$40, making it the best entry-level option for households adding their first weather radio.

Key Specifications:

• Frequency: 162.400-162.550 MHz (all 7 NWR channels)
• S.A.M.E. codes: stores up to 25 county codes
• Power: AC adapter with battery backup (3x AA)
• Alarm: audible alarm with flashing strobe
• Price range: $25-$40

Best Portable Option: Midland ER310 Emergency Radio

The Midland ER310 adds hand-crank power generation and solar charging to full S.A.M.E. weather radio functionality. This is the right choice for households that want a single device for both everyday monitoring and emergency preparedness when power is out.

Key Specifications:

• Frequency: 162.400-162.550 MHz (all 7 NWR channels) plus AM/FM
• S.A.M.E. codes: programmable county-level filtering
• Power: hand crank, solar panel, USB charging, 3x AAA battery backup
• Additional features: 2000 mAh power bank for phone charging, LED flashlight, SOS beacon
• Price range: $55-$75

Best Desk Model for Heavy Users: Uniden BC365CRS

The Uniden BC365CRS offers 365-channel scanning capability alongside full S.A.M.E. weather radio reception, making it ideal for users who also want to monitor local public safety, fire, and EMS frequencies in addition to NWR broadcasts.

Key Specifications:

• Frequency: 25-512 MHz scanner plus 162.400-162.550 MHz NWR
• S.A.M.E. codes: 25 programmable county codes
• Power: AC adapter with battery backup
• Price range: $70-$100

Use the table below to match the right weather radio to your household’s specific needs in the St. Louis area.

For most St. Louis-area households, the Midland WR400 is the correct choice, with the Midland ER310 as the upgrade if you also want a portable emergency kit device that functions during extended power outages.

NWR Alert Types Broadcast on St. Louis Frequencies

The St. Louis NWS office (call sign LSX) issues alerts across a broad range of event types, all of which are broadcast over WXL58 (162.550 MHz) and WXK49 (162.400 MHz). Understanding which alert types trigger an alarm on your weather radio, versus which ones are informational-only broadcasts, helps you configure alert filtering appropriately.

According to NOAA, NWR broadcasts more than 40 distinct EAS (Emergency Alert System) event codes. Weather radios with alert type filtering (such as the Midland WR400) let you choose which of these event codes activate the alarm.

The most critical alert types for St. Louis-area residents, by threat frequency and life-safety impact, are listed below.

• Tornado Warning (TOR): Issued when a tornado has been detected by radar or confirmed by a trained spotter. This is the highest-priority alert for St. Louis. Always activate alarm for this event code.
• Severe Thunderstorm Warning (SVR): Issued for storms producing winds of 58 mph or greater, or hail of 1 inch or larger. Common in St. Louis from March through October.
• Flash Flood Warning (FFW): Issued when flash flooding is occurring or imminent. Particularly relevant for low-lying areas near the Missouri and Mississippi Rivers and their tributaries.
• Tornado Watch (TOA): Issued when conditions are favorable for tornado development across a broad area. Does not mean a tornado is occurring, but requires readiness.
• Winter Storm Warning (WSW): Issued for significant snow, ice, or blizzard conditions. St. Louis averages several winter storm events per season.
• Extreme Cold Warning (ECW): Issued when wind chill temperatures are expected to drop below -20°F. Life-threatening exposure risk.
• Civil Emergency Message (CEM): Issued by local emergency management for non-weather events such as hazardous materials incidents, dam failures, or public safety threats.
• AMBER Alert (CAE): Child abduction emergency. Many users disable this event code for overnight alarm activation while keeping it active during daytime hours.
• Required Monthly Test (RMT): A scheduled test broadcast. Consider disabling alarm activation for this code to avoid unnecessary nighttime alerts.

The NWS St. Louis office issues Tornado Warnings more frequently than the national average due to the region’s position along the central tornado corridor, making a properly configured S.A.M.E. weather radio a more critical life-safety tool here than in many other parts of the country.

Knowing which alert types matter most in St. Louis and configuring your radio’s alarm activation settings accordingly is the last step in a complete weather radio setup.

Placement and Antenna Tips for Better NWR Reception in St. Louis

NWR signals at 162 MHz propagate as VHF FM signals, which means they travel in near-straight lines and are attenuated by physical obstructions. Reception quality in the St. Louis metro area varies significantly based on where you are relative to the WXL58 transmitter and what is between your radio’s antenna and the broadcast source.

This happens because VHF signals in the 162 MHz range behave like light in terms of propagation: they travel line-of-sight and do not bend around large obstacles such as hills, concrete buildings, or dense urban construction the way lower-frequency AM radio signals do.

Reception is strongest when your antenna has a clear vertical path toward the transmitter, with minimal obstructions. It degrades when the antenna is placed on a lower floor in a dense urban high-rise, inside a metal enclosure, or in a basement.

If your weather radio’s built-in telescoping antenna produces weak or static-filled reception, an external antenna can significantly improve signal quality. The dedicated outdoor NWR antenna options for home use typically mount in an attic or on an exterior wall and connect via standard coaxial cable to a BNC or SMA connector on your radio.

Practical placement tips for St. Louis-area weather radio users:

• Place the radio on an upper floor or near a window facing northwest (toward WXL58’s St. Louis transmitter location) for best signal.
• Fully extend the telescoping antenna and orient it vertically.
• Keep the antenna away from metal objects, refrigerators, and microwave ovens, which can reflect or absorb VHF signals.
• If you live in a basement apartment or below-grade space, consider running an external antenna wire to a window at or above ground level.
• Illinois-side residents should orient toward Carlinville (northeast of most Metro East communities) for the WXK49 signal on 162.400 MHz.

A radio placed in a good reception location with its antenna fully extended will outperform a higher-end radio with a poor antenna position.

St. Louis Weather Radio Coverage Gaps and Fringe Areas

No NWR transmitter provides perfectly uniform coverage across the entire St. Louis metro area. Both WXL58 and WXK49 have areas of stronger and weaker signal, and there are specific locations within the metro where residents may experience marginal reception requiring an external antenna or a secondary transmitter.

Known coverage considerations for the St. Louis area:

• Jefferson County (southern portions): Signal from WXL58 on 162.550 MHz can be marginal in hilly terrain south of Festus and De Soto. An external antenna or elevated placement improves reception significantly.
• Franklin County (western portions): Residents in the Washington, MO area and further west may find WXL58 signal weaker. The 162.550 MHz signal from a Columbia, MO-area transmitter may occasionally be receivable as a secondary option.
• Illinois fringe counties (Macoupin, Montgomery, Bond): These counties sit at the outer edge of WXK49’s primary coverage footprint from Carlinville. Reception in low-lying or forested areas may be marginal.
• Dense urban core areas: High-rise buildings in downtown St. Louis can create signal shadows. Upper floors facing the transmitter direction will always outperform lower floors or basement units.

If you are unsure whether your location receives a reliable signal from either primary transmitter, the most direct test is to set your weather radio to scan mode and observe whether it locks onto 162.550 MHz or 162.400 MHz with a clean signal indicator (no or minimal static on squelch open).

A Sangean CL-100 weather radio or similar model with a signal strength meter display makes it easy to visually confirm reception quality at different antenna positions and locations in your home.

Residents in fringe areas should also consider enabling the radio’s alarm for both 162.550 MHz and 162.400 MHz to ensure at least one transmitter’s signal reaches them during severe weather events, when atmospheric conditions can sometimes affect propagation.

Using a Weather Radio App vs a Physical Radio in St. Louis

Smartphone apps that deliver NWS alerts (such as the FEMA app, Weather.gov notifications, or Wireless Emergency Alerts via the cellular network) provide alert coverage in St. Louis, but they depend entirely on cellular network availability, smartphone battery life, and active data connectivity. A dedicated weather radio on 162.550 MHz operates independently of all of those systems.

During significant severe weather events in the St. Louis area, cellular network congestion frequently causes delayed or missed push notifications on smartphones, precisely when timely alerts matter most.

According to FEMA, the Integrated Public Alert and Warning System (IPAWS) uses multiple parallel channels including NWR, the Emergency Alert System on broadcast TV/radio, and Wireless Emergency Alerts via cellular. Relying on a single channel reduces redundancy and increases the risk of a missed notification.

The practical recommendation for St. Louis residents is to use both: a dedicated S.A.M.E. weather radio as the primary overnight alert device (since it functions without cellular connectivity and draws minimal power), and smartphone alerts as a secondary daytime layer.

If you are weighing the trade-offs between these options in more detail, our comparison of weather radio apps versus dedicated physical receivers for emergency alerts covers reliability, coverage gaps, and battery independence in depth.

A physical weather radio tuned to 162.550 MHz with your correct S.A.M.E. code programmed will alert you during a tornado warning even if your phone is dead, the cell tower is overloaded, and the power is out, because it runs on battery backup and needs no internet connection.

St. Louis Severe Weather Seasons and When Your Radio Matters Most

St. Louis experiences severe weather threats in every season, but the frequency and severity of life-threatening events peaks during two distinct windows. Knowing when to be most vigilant about your weather radio’s operational status can help you prioritize battery checks, antenna inspections, and firmware or S.A.M.E. code verification.

According to NWS St. Louis historical data, the peak tornado and severe thunderstorm season for the St. Louis area runs from March through June, with a secondary active period in October and November.

• March-June (peak severe weather season): Tornado warnings, severe thunderstorm warnings, and flash flood warnings are most frequent. This is when a properly configured S.A.M.E. weather radio is most critical. Check batteries, verify S.A.M.E. codes, and confirm alarm volume before this window opens.
• July-August (heat and flash flood season): Extreme heat warnings, heat advisories, and flash flood watches are common. Thunderstorms remain active but tornado frequency decreases.
• September-November (secondary severe season): A second tornado and severe thunderstorm window opens in fall. Ice storm threats begin emerging in November.
• December-February (winter storm season): Winter Storm Warnings, Ice Storm Warnings, and Extreme Cold Warnings are the dominant alert types. Battery backup becomes especially important because power outages during ice storms can last multiple days.

The NWS St. Louis office conducts required monthly EAS tests on NWR, which are broadcast on both 162.550 MHz and 162.400 MHz. These tests are announced in advance and provide an opportunity to verify your radio is operational and your S.A.M.E. codes are correctly programmed, since the test header includes county codes and your radio should not alarm unless you have specifically enabled alarm activation for the Required Monthly Test event code.

For a comprehensive breakdown of how to prepare your weather radio as part of a broader household emergency communication plan, our guide on incorporating a weather radio into a complete emergency preparedness kit covers power backup strategies, alert redundancy, and communication planning for multi-day severe weather events.

Checking your weather radio’s batteries and S.A.M.E. code programming once in late February (before peak tornado season) and once in late November (before peak ice storm season) is a simple habit that ensures the radio is ready when you need it most.

All Seven NOAA Weather Radio Frequencies Explained

NOAA Weather Radio All Hazards broadcasts on exactly seven VHF frequencies, all within the 162.400-162.550 MHz band, designated WX1 through WX7 on consumer weather radios. According to NOAA NWR technical documentation, these frequencies were allocated exclusively for NWR use by the FCC and are not shared with any commercial or amateur radio service.

Each transmitter in the NWR network is assigned to one of these seven frequencies. Adjacent transmitters are assigned different frequencies to prevent interference in overlap zones.

Use the table below to identify each frequency’s designation and its typical usage in the St. Louis-area NWR network.

For the complete national breakdown of all seven NWR frequencies, their geographic distribution, and which transmitters use each channel across the United States, our detailed reference on all seven NOAA Weather Radio frequencies and their broadcast assignments provides the full technical breakdown.

St. Louis-area residents need to know two frequencies: 162.550 MHz for Missouri-side coverage via WXL58, and 162.400 MHz for Illinois Metro East coverage via WXK49.

Frequently Asked Questions About St. Louis Weather Radio Stations and SAME Codes

What frequency does NOAA weather radio broadcast on in St. Louis?

The primary NWR frequency for the Missouri side of the St. Louis metro area is 162.550 MHz, broadcast by transmitter WXL58 in St. Louis. The primary frequency for the Illinois Metro East side of the metro is 162.400 MHz, broadcast by transmitter WXK49 in Carlinville, Illinois. Both are 24-hour continuous broadcasts operated by the National Weather Service St. Louis office (LSX).

Most consumer weather radios have a WX1-WX7 channel selector. WX1 corresponds to 162.550 MHz and WX2 corresponds to 162.400 MHz. Set your radio to WX1 if you live on the Missouri side, or WX2 if you live in the Metro East Illinois area.

What is the S.A.M.E. code for St. Louis County, Missouri?

The S.A.M.E. code for St. Louis County, Missouri is 029189. This is the 6-digit FIPS county code you enter into your weather radio’s S.A.M.E. programming menu. St. Louis City is a separate legal entity from St. Louis County and has its own distinct code: 029510.

If you live in the city limits of St. Louis, use 029510. If you live in St. Louis County (including municipalities such as Clayton, Kirkwood, Webster Groves, or Chesterfield), use 029189. You can program both codes simultaneously on any weather radio that supports multiple S.A.M.E. locations.

What is the S.A.M.E. code for St. Charles County?

The S.A.M.E. code for St. Charles County, Missouri is 029183. Residents of St. Peters, O’Fallon (MO), Wentzville, and other St. Charles County communities should program this code into their weather radio. St. Charles County is primarily served by WXL58 on 162.550 MHz.

What S.A.M.E. codes should Metro East Illinois residents use?

Residents of the Illinois Metro East area should use the following S.A.M.E. codes: Madison County 017119, St. Clair County 017163, Monroe County 017133, Jersey County 017083, and Clinton County 017027. All Illinois FIPS S.A.M.E. codes begin with 017, which is Illinois’s state identifier in the FIPS geographic coding system.

Metro East residents should tune to 162.400 MHz (WX2) for the strongest signal from WXK49 in Carlinville, Illinois. Programming the appropriate Illinois county code on that frequency ensures alerts are filtered to your specific county rather than the entire transmitter coverage area.

Can I receive both Missouri and Illinois NWR transmitters on the same radio?

Yes. Any weather radio that supports scanning all seven NWR frequencies can receive both WXL58 on 162.550 MHz and WXK49 on 162.400 MHz. Most consumer weather radios with S.A.M.E. functionality allow you to program multiple county codes from different states simultaneously.

This is particularly useful for residents who live near the Missouri-Illinois border, commute across the river, or want alerts from both sides of the metro. Program your Missouri county code alongside your Illinois county code, and the radio will alarm for alerts affecting either location regardless of which transmitter originates the broadcast.

Why is my weather radio alarming for counties I do not live in?

If your weather radio is triggering alarms for counties outside your area, S.A.M.E. filtering is either not enabled or not correctly programmed. A weather radio without an active S.A.M.E. code programmed will alarm for every alert issued anywhere within the transmitter’s broadcast footprint, which can span 30 or more counties.

Enter the 6-digit FIPS S.A.M.E. code for your specific county through your radio’s programming menu (see the programming steps in this guide for the Midland WR400, WR120, and Uniden BC365CRS). After programming your county code, confirm the radio returns to normal monitoring mode and test it by enabling alarm activation for the next scheduled Required Monthly Test broadcast.

Does a weather radio need Wi-Fi or cellular connectivity to receive NWR alerts?

No. A dedicated weather radio receives NWR broadcasts directly via VHF radio waves at 162 MHz, with no Wi-Fi, cellular network, or internet connection required. This is one of the primary advantages of a dedicated weather radio over smartphone-based alert apps.

During severe weather events in St. Louis, when cellular networks become congested or cell towers lose power, a weather radio on battery backup continues to function and receive alerts without interruption. This independence from the cellular and internet infrastructure is why FEMA and NOAA recommend a dedicated weather radio as part of every household emergency preparedness kit.

What is the difference between a Tornado Watch and a Tornado Warning on NOAA weather radio?

A Tornado Watch (event code TOA) means atmospheric conditions are favorable for tornado development across a broad area, typically several counties. It is issued in advance, sometimes hours before severe weather arrives, and requires readiness and awareness but not immediate protective action.

A Tornado Warning (event code TOR) means a tornado has been detected by radar or confirmed by a trained spotter and is occurring or imminent in a specific location. When your weather radio alarms for a Tornado Warning with your county’s S.A.M.E. code in the header, take shelter immediately. The NWS St. Louis office issues Tornado Warnings with polygon-based geographic boundaries, so the broadcast header identifies specific counties in the warning area at the time of issuance.

How do I test whether my weather radio’s S.A.M.E. code is programmed correctly?

The most reliable test is to monitor the NWS St. Louis website or the NOAA NWR schedule for the next Required Monthly Test (RMT) broadcast for your county. These tests are conducted on a rotating monthly schedule and use the same S.A.M.E. header encoding as actual alerts.

If your radio has alarm activation enabled for the RMT event code, it will alarm during the test and confirm that your county code is recognized. If it does not alarm during a confirmed test broadcast for your county, re-enter the S.A.M.E. code through the programming menu and verify you entered all six digits correctly. A common programming error is entering five digits instead of six, or confusing St. Louis City (029510) with St. Louis County (029189).

Can I use the same weather radio I currently own if I move from Missouri to Illinois within the St. Louis metro?

Yes. Any S.A.M.E.-capable weather radio can be reprogrammed with new county codes after a move. The process takes less than five minutes on most consumer radios. You will need to delete or overwrite your Missouri county code (beginning with 029) and enter the appropriate Illinois county code (beginning with 017).

You should also verify that your new location receives a stronger signal from WXK49 on 162.400 MHz (the Illinois-side transmitter) rather than WXL58 on 162.550 MHz, and adjust your primary monitoring frequency accordingly. Let the radio scan all seven NWR frequencies after the move and observe which channel produces the strongest, cleanest signal at your new address.

How often should I replace the backup batteries in my weather radio?

Replace AA or AAA alkaline backup batteries in your weather radio once per year, regardless of whether the radio has alarmed. Battery capacity degrades over time even during standby use, and alkaline batteries can leak and damage the battery compartment if left installed for more than 12-18 months.

A practical habit for St. Louis residents is to replace batteries in late February, before the peak March-June tornado and severe thunderstorm season begins. Use name-brand alkaline batteries (Duracell or Energizer) rather than budget store brands, which have shorter shelf lives and higher rates of leakage in standby applications.

Is there a way to receive St. Louis NWR alerts on a two-way radio or scanner?

Yes. Any VHF scanner or wide-band receiver capable of receiving the 162.400-162.550 MHz range can monitor NWR broadcasts. The Uniden BC125AT handheld scanner and similar devices receive all seven NWR frequencies and can be programmed to monitor WXL58 on 162.550 MHz alongside local public safety channels.

However, a standard scanner without a S.A.M.E. decoder chip cannot perform county-level alert filtering. It will receive the full broadcast audio, including the digital burst header and the voice alert, but it cannot trigger an alarm only for your specific county. For overnight alarm use, a dedicated S.A.M.E. weather radio is necessary. A scanner is a useful supplemental monitoring tool but not a replacement for a dedicated weather radio with S.A.M.E. functionality.

What is the NWS St. Louis office call sign and what counties does it cover?

The National Weather Service St. Louis forecast office uses the call sign LSX. It issues weather forecasts and alerts for a coverage zone that includes eastern Missouri (including St. Louis City, St. Louis County, St. Charles, Jefferson, Franklin, Washington, and surrounding counties) and parts of southwestern Illinois (including Madison, St. Clair, Monroe, Jersey, and Clinton counties).

Some outer counties in the greater St. Louis region fall under adjacent NWS offices: NWS Paducah (PAH) covers some southeast Missouri and southern Illinois counties, NWS Lincoln, Illinois (ILX) covers central Illinois counties, and NWS Kansas City (EAX) covers western Missouri counties. If your county’s NWR alerts seem to originate from a different NWS office than expected, this geographic boundary between forecast office coverage zones is the reason.

The complete list of Missouri NWR transmitter assignments by county, including which NWS office issues alerts for each county, is available through our broader guide covering NOAA Weather Radio station assignments across Missouri and adjacent states.

Tuning to 162.550 MHz on a properly configured weather radio with S.A.M.E. code 029189 (St. Louis County) or 029510 (St. Louis City) gives you direct, uninterrupted access to NWS St. Louis alerts the moment they are issued, with no app, no cellular signal, and no intermediary system between you and the broadcast. Program your county code, confirm your battery backup is fresh, and place the radio where the alarm will wake you from any room in your home. That single setup step is what the system was designed to deliver.