A severe thunderstorm warning (SAME code: SVR) is issued when trained storm spotters or a Doppler weather radar indicate a strong thunderstorm is producing dangerously large hail or high winds, capable of causing significant damage. In the United States, it does not account for lightning, a significant hazard in any thunderstorm, or flooding caused by a severe thunderstorm's extreme rainfall. (a Flood advisory or Flash flood warning is issued in this case). A similar warning is issued by Environment Canada's Meteorological Service of Canada from their offices in Vancouver, Edmonton, Toronto, Montreal and Dartmouth. Skywarn issues the warnings for the United Kingdom.
Read more about Severe Thunderstorm Warning: Definition, Criteria in Various Countries, Examples of A Severe Thunderstorm Warning
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