The United States, Canada and Bermuda operate their government weather radio stations on the same band.
The original numbering was from the order in which the frequencies were assigned, with 162.55 at first the only frequency, then 162.4 and 162.475 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 into remote or mountainous areas.
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 162.55 MHz from Hamilton, now operated by the Bermuda Weather Service. It has a second station, however, for marine conditions and forecasts, ZBR, at 162.400 MHz.
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 that allow more advanced receivers to only listen for certain warnings that carry a specific code for the local area, and often to alarm only for serious warnings (for example, a flood warning could be ignored by a person living on a mountain, while a tornado warning is an immediate emergency in all cases).
|Frequency||Old name||New name|
|162.400 MHz||WX 2||WX 1|
|162.425 MHz||WX 4||WX 2|
|162.450 MHz||WX 5||WX 3|
|162.475 MHz||WX 3||WX 4|
|162.500 MHz||WX 6||WX 5|
|162.525 MHz||WX 7||WX 6|
|162.550 MHz||WX 1||WX 7|