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A severe thunderstorm watch (SAME code: SVA) is a statement issued by weather forecasting agencies to advise the public that atmospheric conditions in a given region may lead to the development of severe thunderstorms within (or near) the region over a period of several hours.
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]
Isolated tornadoes are possible but not expected to be the dominant severe weather event, hence these watches are very rarely issued. An expected severe wind event is the mostly likely reason for a PDS severe thunderstorm watch to be issued, with widespread winds greater than 90 mph (150 km/h or 80 knots) possible. These watches are usually ...
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 ...
When severe weather looms, storm alerts are important tools for keeping people informed. The National Weather Service shares alerts as it warns of potential risks from thunderstorms, flooding ...
Here's what to know about the differences between a severe weather watch or warning from the National Weather Service.
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 ...
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.