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A watch means that conditions are favorable for severe weather, but not immediately occurring, according to the National Weather Service, which is responsible for issuing weather alerts.
In Canada, governmental weather warnings and watches are issued by the Environment Canada. Environment Canada defines an advisory as "an alert to cover a wide array of deteriorating weather conditions," a watch as "when conditions favour that severe weather forming" and a warning as "severe weather is actually occurring or is imminent ...
A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the scale from one to five, a high risk is a level five; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak.
Severe thunderstorm emergency (SVS) – Sent as a "severe weather statement" or a complete re-issuance of the severe thunderstorm warning, this is an unofficial, high-end severe thunderstorm warning that is occasionally issued when a significant severe thunderstorm is imminent or impacting a highly populated area.
Severe thunderstorm watch vs. severe thunderstorm warning. Severe thunderstorms — which are defined by the National Weather Service as storms with “winds of 58 mph or higher and/or hail 1 inch ...
Generally, a warning covers a smaller geographic area and comes when the threat is more “imminent,” McClatchy News reported. For example, the weather service puts out a tornado watch “when ...
See Severe weather terminology (United States) and/or Severe weather terminology (Canada) for comprehensive articles concerning specific nations' warnings, watches, advisories and related terms. Pages in category "Weather warnings and advisories"
The National Weather Service has already issued extended a tornado watch for Middle Tennessee until 9 p.m. Tuesday. The weather service said wind gusts are likely to reach up to 75 mph and also ...
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