TornadoEarlyWarningSystem.com

Title

Tornado Early Warning System - Your online Tornado information resource and directory.

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Excerpted from the website description:


TORNADO EARLY WARNING SYSTEM
A tornado warning means there is immediate danger for the warned and immediately surrounding area -- if not from the relatively narrow tornado itself, from the severe thunderstorm producing (or likely to produce) it. All in the path of such a storm are urged to take cover immediately, as it is a life-threatening situation. A warning should not be confused with a tornado watch (issued by a national guidance center, the Storm Prediction Center) which only indicates that conditions are favorable for the formation of tornadoes.


See Also
Tornado Strength Scale

In the United States, local offices of the National Weather Service issue warnings for tornadoes and severe thunderstorms on a per-county basis, narrowing down to parts of counties in many cases, and usually with a narrower pathcast of where the tornado(s) is expected to track within the area is mentioned in the warning message.

In Canada, similar criteria are used and warnings are issued by regional offices of the Meteorological Service of Canada of Environment Canada in Vancouver, Edmonton, Toronto, Montreal and Halifax.

Tornado warnings are generated via computer then disseminated through various communication routes accessed by the media and various agencies, on the internet, to NOAA satellites, and on NOAA Weather Radio. Civil defense sirens are also activated for the affected areas if present.

The first tornado warning was issued by the meteorological staff of Tinker Air Force Base in 1947 and was also coincidentally the first successful tornado forecast.

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