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In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]
Severe thunderstorm emergency SVR (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.
Here's what to know about the differences between a severe weather watch or warning from the National Weather Service.
What should I do during a severe thunderstorm or tornado warning? During a severe weather warning, it's time to take action and follow your plan. NWS has tips for what to do at different locations:
PDS severe thunderstorm watches are issued when there is a higher than normal risk of severe thunderstorm winds capable of major structural damage (in addition to large hail and perhaps a few isolated tornadoes), usually due to a strong and persistent derecho. These watches are very rare (accounting an average of only two each year), as the ...
What's the difference between weather warnings and watches? What is an advisory? Here are weather safety terms you need to know.
But when forecasters issue a watch or a warning for a specific area, ... the weather service puts out a tornado watch “when severe thunderstorms and tornadoes are possible in and near the watch ...
Severe weather bulletins are issued as a watch or a warning, depending on the risk or severity of the event. Watches are issued when conditions are favourable for the development of severe weather, but the occurrence, location, and/or timing is still too uncertain to issue a warning. The target lead time for severe thunderstorm watches is ...
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