Weather radio

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This article is about weather radio in general. For the service in the United States, see NOAA Weather Radio All Hazards. For the service in Canada, see Weatheradio Canada.
A Gorman-Redlich CRW-S weather radio

A weather radio service is a broadcast service that airs weather reports. When the radio is on and tuned to the weather band, it airs both normal and emergency weather information. If the radio is off or tuned to another band, it automatically turns on and goes to the weather band for emergency weather information.

Weather radio services may also broadcast non-weather-related emergency information, such as in the event of a natural disaster, an AMBER alert or a terrorist attack. They generally broadcast in a preallocated very high frequency (VHF) range using FM. Usually a dedicated weather radio receiver or radio scanner is needed for listening, although in some locations a weather radio broadcast may be retransmitted on a conventional AM or FM frequency (as well as HD Radio substations), some terrestrial television stations broadcasting in MTS stereo transmit weather radio on their second audio program (SAP) channel as well as on one of its digital subchannels (where news and weather are applicable), on local public, educational, and government access (PEG) cable TV channels or during Emergency Alert System activations for tornado warnings primarily on cable systems.

Two types of weather radio receivers; the common Midland home weather radio (model WR-100) to the right is often the most popular and known unit sold in the United States, while the orange Oregon Scientific model on the left is portable and water-resistant for outdoor use.

Weather radios come with several features that make them very helpful in case of an emergency. Some models use crank power, in addition to mains electricity and batteries in case of a power outage. Some models have an embedded flashlight, and can double as a cellphone charger. Some also serve as a more general emergency radio.

Weather radios are widely sold in home electronics stores and even many supermarkets and drugstores in the United States and Canada, with the supermarkets and drugstores selling them more in the southern and midwestern U.S., which is in Tornado Alley. The price of a consumer model weather radio varies depending on the model and its extra features. Historically, it was not uncommon to sell combination radios that included AM, FM, and VHF TV audio bands, with the weather radio band included some distance down the dial from VHF TV channel 7; after the U.S. digital TV conversion, these types of radios became mostly obsolete.

Most receivers from the 2000s and the 2010s, and even some from the mid-1990s, are able to listen silently for weather alerts via the SAME protocol and then sound an alarm to warn the listener of the oncoming weather or event. Additionally, many weather radio vendors also include a visual element such as colored warning LEDs, vibration device or strobe lights which attach via an accessory port to give a warning to those who are hearing impaired.

Governmental weather radio services[edit]

Frequency Official name Marine Channel Public Alert Channel
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 WX8 21B
161.775 MHz WX9 83B
163.275 MHz WX10 113B

The United States, Canada and Bermuda operate their government weather radio stations on the same band.

WX1 through WX7 are the NOAA channels; WX8 and WX9 are Canadian Continuous marine broadcast channels. WX10 was formerly used by the NWS for coordination during power outages. Some equipment manuals confuse the WX and Public Alert numbering schemes, and provide the incorrect label for channels. The WX1 through WX7 frequency assignments are from NOAA,[1] and are consistently used across U.S. Government agencies, including the Coast Guard.[2]

Notable weather radio services include:

The WX numbering scheme does not increase in frequency order because the weather channels were created gradually over the years. 162.55 was at first the only frequency (so was thus WX1), then 162.4 (WX2) and 162.475 (WX3) were added later to prevent RF interference. The others mainly came into use in the 1990s in less-populated rural, areas and as fill-in broadcast translators relaying an existing station or sending a separate, more localized broadcast into remote or mountainous areas, or those areas with reception trouble.

Canadian broadcasts are also transmitted on travelers' information stations on FM and AM, especially near national parks.

Bermuda has only one station dedicated purely for weather, on 162.550 MHz from Hamilton, now operated by the Bermuda Weather Service with tropical weather forecasts from NOAA. It has a second station, however, for marine conditions and forecasts, ZBR (operated by the Bermuda Maritime Operations Centre), at 162.400 MHz.[3][4]

All stations transmit a 1050 Hz tone immediately before issuing a watch or warning, and this serves to activate the alert feature on many older radios. Except for Bermuda, all U.S. and later Canadian stations transmit WRSAME codes a few seconds before the 1050 Hz tone that allow more advanced receivers to only listen for certain warnings that carry a specific code for the local area, and often to have an option to only sound the alarm for serious warnings by default, and other alerts at the user's discretion (for example, a flash flood watch could be ignored by a person living on the top of a hill, while a tornado warning is an immediate emergency in all cases). However, disabling the alarm will still show a scroll on the display.[citation needed]

Commercial weather radio services[edit]

The weather radio band is reserved for governmental services. However, most AM and FM radio stations provide some sort of private weather forecasting, either through relaying public-domain National Weather Service forecasts, partnering with a meteorologist from a local television station (or using a meteorologist hired by the station, common when a radio station is a sister station of their TV counterpart or has a news and forecast-sharing agreement), affiliating with a commercial weather service company, or (in the most brazen cases) pirating a commercial service's public forecasts without payment or permission. (The first option is not available, or at least legal, in Canada, where Environment Canada's forecasts are under crown copyright.) Accuweather (through United Stations) and The Weather Channel (through Westwood One's NBC Radio Network) both operate large national weather radio networks through AM and FM stations.

History of Weather Radio[edit]

The Weather Bureau first began broadcasting marine weather information in Chicago and New York City on two VHF radio stations in 1960 as an experiment.[5][6] Proving to be successful, the broadcasts expanded to serve the general public in coastal regions in the 1960s and early 1970s.[7] The United States Weather Bureau adopted its current name, The National Weather Service (NWS) and was operating 29 VHF-FM weather-radio transmitters in the National Oceanic and Atmospheric Administration (NOAA) in 1970.[5] In 1974, NOAA Weather Radio, as it was now called, reached about 44 percent of the U.S. population over 66 nationwide transmitters.[7] The NOAA grew to over 300 stations by the late 1970s.[6] Local National Weather Service staff were the voices heard on NOAA Weather Radio stations from its induction until the late 1990s when "Paul" was introduced.[8][9] The messages were recorded on tape, and later by digital means, then placed in the broadcast cycle.[8] "Paul" was a computerized voice using the DECTalk text-to-speech system.[8] "Paul's" voice was dissatisfactory and difficult to understand, thus "Tom," "Donna" and later "Javier" were introduced in 2002 using the Speechify text-to-speech system.[8][9] The human voices are still used occasionally for weekly tests of the Specific Area Message Encoding and 1050 Hz tone systems, station IDs, and in the event of system failure or computer upgrades. They will also be used on some stations for updates on the time and radio frequency.

In 1998, the National Weather Service adopted plans to implement SAME technology nationwide; however, the roll-out moved slowly until 1995 when the U.S. government provided the budget needed to develop the SAME technology across the entire radio network. Nationwide implementation occurred in 1997 when the Federal Communications Commission (FCC) adopted the SAME standard as part of its new Emergency Alert System.[5] NOAA weather radio expanded from simply weather alerts to "All Hazards" being broadcast in 1990.[10] The National Weather Service grew to over 800 radio stations by the end of 2001.[5] As of January 2014, there are 1,023 stations covering approximately 97% of the United States, Puerto Rico, the U.S. Virgin Islands, American Samoa, Guam and the Northern Mariana Islands.[5]


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  5. ^ a b c d e "The History of NOAA Weather Radio". Weather Radios Direct. Retrieved 13 May 2014. 
  6. ^ a b "History of NOAA Weather Radio". National Oceanic and Atmospheric Administration (NOAA). 
  7. ^ a b Nelson, W.C. (2002). "American Warning Dissemination and NOAA Weather Radio". 
  8. ^ a b c d "Voices Used on NOAA Weather Radio". National Weather Service. Retrieved 3 July 2012. 
  9. ^ a b "Voice Improvement Processor". National Oceanic and Atmospheric Administration (NOAA). 
  10. ^ Kupec, R. J. (July–August 2008). "Tuning in: Weather radios for those most at risk". Journal of Emergency Management 6 (4).