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A weather radio is a specialized radio receiver that is designed to receive a public broadcast service, typically from government-owned radio stations, dedicated to airing weather reports on a continual basis, with the routine weather reports being interrupted by emergency weather reports whenever needed. Weather radios are typically equipped with a standby alerting function—if the radio is muted or tuned to another band and a severe weather bulletin is transmitted, it can automatically sound an alarm and/or switch to a pre-tuned weather channel for emergency weather information.

Weather radio services may also broadcast non-weather-related emergency information, such as in the event of a natural disaster, a child abduction alert, or a terrorist attack. They generally broadcast in a pre-allocated very high frequency (VHF) range using FM. Usually a radio scanner or a dedicated weather radio receiver is needed for listening, although in some locations a weather radio broadcast may be re-transmitted on an AM or FM broadcast station, on terrestrial television stations, or local public, educational, and government access (PEG) cable TV channels or during weather or other emergencies.

Weather radio receivers

Weather radios are generally sold in two varieties: home (stationary) or portable use. Portable models commonly offer specialized features that make them more useful in case of an emergency. Some models use crank power, in addition to mains electricity and batteries, in case of a power outage.

Sangean DT-400W (10711303835)

Smaller hand-held weather receivers generally do not support the SAME alert type encoding, but allow hikers and other explorers to listen to weather reports without packing a heavy and bulky base station radio. Some models have a built-in flashlight and can double as a cellphone charger. Some also serve as a more general emergency radio and may include multiband and two-way communication capability. "Scanner" radios designed to continuously monitor the VHF-FM public service band are already able to receive weather channels.

A Gorman-Redlich CRW-S weather radio

Besides SAME alerting capability, modern weather radio receivers

Weather radio services may also broadcast non-weather-related emergency information, such as in the event of a natural disaster, a child abduction alert, or a terrorist attack. They generally broadcast in a pre-allocated very high frequency (VHF) range using FM. Usually a radio scanner or a dedicated weather radio receiver is needed for listening, although in some locations a weather radio broadcast may be re-transmitted on an AM or FM broadcast station, on terrestrial television stations, or local public, educational, and government access (PEG) cable TV channels or during weather or other emergencies.

Weather radios are generally sold in two varieties: home (stationary) or portable use. Portable models commonly offer specialized features that make them more useful in case of an emergency. Some models use crank power, in addition to mains electricity and batteries, in case of a power outage.

Sangean DT-400W (10711303835)

Smaller hand-held weather receivers generally do not support the SAME alert type encoding, but allow hikers and other explorers to listen to weather reports without packing a heavy and bulky base station radio. Some models have a built-in flashlight and can double as a cellphone charger. Some also serve as a more general emergency radio and may include multiband and two-way communication capability. "Scanner" radios designed to continuously monitor the VHF-FM public service band are already able to receive weather channels.

A Gorman-Redlich CRW-S weather radio

Besides SAME alerting capability, modern weather radio receivers, especially those that are compliant with CTA standard 2009-B, may include visual alerting elements (e.g., multicolored LED indicator lights) and allow for the use o

Smaller hand-held weather receivers generally do not support the SAME alert type encoding, but allow hikers and other explorers to listen to weather reports without packing a heavy and bulky base station radio. Some models have a built-in flashlight and can double as a cellphone charger. Some also serve as a more general emergency radio and may include multiband and two-way communication capability. "Scanner" radios designed to continuously monitor the VHF-FM public service band are already able to receive weather channels.

A Gorman-Redlich CRW-S weather radio

Besides SAME alerting capability, modern weather radio receivers, especially those that are compliant with CTA standard 2009-B, may include visual alerting elements (e.g., multicolored LED indicator lights) and allow for the use of external devices (e.g., pillow vibrators, bed shakers, strobe lights, and loud sirens, which attach via an accessory port) to alert those who are deaf or hearing impaired.

Global weather radio services

Navtex, which is a low-frequency facsimile radio service.

North American weather radio services

Channel

The United States' NOAA, Canada's Weatheradio, Mexico's SARMEX and Bermuda operate their government weather radio stations on the same marine VHF radio band, using FM transmitters, and the same seven frequencies (162.400 - 162.550 MHz) as NOAA Weather Radio (NWR).[2][3] Bermuda only uses 162.550 (land) and 162.400 (marine).[4][5] NWR transmitters operate VHF-FM between 5–1000 watts. NWR channels operating in the range of 162.3625-162.5875 MHz (WX1-WX7) have a band spacing of band spacing of 25 kHz may have bandwidths up to 16 kHz.[6] The original "weather" frequency was 162.550 MHz, with 163.275 MHz initially recommended as a backup and later dropped due to interference problems with other federal agencies.

NOAA Weather Radio, Weatheradio and SARMEX all refer to the seven stations by their frequencies:
162.400, 162.425, 162.450, 162.475, 162.500, 162.525 and 162.550 MHz.[7][8][9][10]

Other channel designations such as WX1 through WX7 "have no special significance but are often designated this way in consumer equipment" and "other channel numbering schemes are also prevalent/possible" according to NOAA and USCG.[11]NOAA Weather Radio, Weatheradio and SARMEX all refer to the seven stations by their frequencies:
162.400, 162.425, 162.450, 162.475, 162.500, 162.525 and 162.550 MHz.[7][8][9][10]

Other channel designations such as WX1 through WX7 "have no special significance but are often designated this way in consumer equipment" and "other channel numbering schemes are also prevalent/possible" according to NOAA and USCG.[11][12] Ordering channels by when they were established (WX1, WX2, …) is "becoming less 'popular' over time than a numerical ordering of channels."[13] Weather radios may list stations in the order of their WX#, or by a "Preset Channel" number 1 thru 7 in ascending frequency order.[14][15][16]

The "WX#" format is continued from WX8 up to WX12 on some lists and radios to include 163.275 MHz and or one or more of the Canadian continuous marine broadcast (CMB) frequencies 161.650, 161.775, 161.750, 162.000. Unlike WX1-WX7 typically ordered by frequency adoption by NWS, there is no consistent frequency inclusion nor assignment for WX8-WX12.[17][18][19] Effective January 1, 2019, channels 2027 (161.950 MHz, 27B) and 2028 (162.000 MHz, 28B) are designated as ASM 1 and ASM 2 respectively for application specific messages (ASM) as described in Recommendation ITU-R M.2092.[20] 163.275 MHz was formerly used by the NWS for coordination during power outages[citation needed].

All stations in United States, Canada, and Bermuda transmit a 1050 Hz attention tone immediately before issuing a watch or warning, and this alone serves to activate the alarm feature on many older or basic alerting radios.

All U.S. and newer Canadian stations transmit WRSAME codes a few seconds before the 1050 Hz attention tone that allow more advanced receivers to respond only for certain warnings that carry a specific code for the local area. SAME codes are defined for counties, parishes, territories, or marine zones, and are set using preassigned six-digit FIPS county codes (in the U.S.) or CLC codes (in Canada). The SAME code protocol also includes an end-of-message (EOM) tone (three short data bursts of the binary 10101011 calibration then "NNNN", which some radios will use to mute the speaker after the alert broadcast has been completed.[21][22]

United States

NOAA Weather Radio (NWR; also known as NOAA Weather Radio All Hazards) is an automated 24-hour network of more than 1000 radio stations[23] in the United States that broadcast weather information directly from a nearby National Weather Service office. A complete broadcast cycle lasts about 3 to 8 minutes long, featuring weather forecasts and local observations, but is interrupted when severe weather advisories, warnings, or watches are issued. It occasiona

NOAA Weather Radio (NWR; also known as NOAA Weather Radio All Hazards) is an automated 24-hour network of more than 1000 radio stations[23] in the United States that broadcast weather information directly from a nearby National Weather Service office. A complete broadcast cycle lasts about 3 to 8 minutes long, featuring weather forecasts and local observations, but is interrupted when severe weather advisories, warnings, or watches are issued. It occasionally broadcasts other non-weather related events such as national security statements, natural disaster information, environmental and public safety statements (such as an AMBER Alert) sourced from the Federal Communications Commission's (FCC) Emergency Alert System. Weather Underground discontinued live streams of NWR broadcasts in 2017.[24]

Canada

In Canada, Weathe

In Canada, Weatheradio Canada transmits in both official languages (English and French) from 230 sites across Canada. Canadian broadcasts are also transmitted on travelers' information stations on AM and FM, especially near national parks.[citation needed]

Caribbean/Atlantic

Normal Exit PeriodicService.php
National Weather Radio Frequencies
for U.S., Canada, and Mexico (et al.)
# WX8-WX12 frequency order and inclusion varies
Frequency WX [1]

Channel

Marine

Channel

Radio

Preset

162.400 MHz WX2 36B 1
162.4

Channel

Marine

Channel

Radio

Preset

162.400 MHz WX2 36B 1
162.425 MHz WX4 96B 2
162.450 MHz WX5 37B 3
162.475 MHz WX3 97B 4
162.500 MHz WX6 38B 5
162.525 MHz WX7 98B 6
162.550 MHz WX1 39B 7
161.650 MHz WX# 21B blank
161.750 MHz WX# Radio <

Preset