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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 weather statement (SVS) – A statement issued to provide updated information for active severe thunderstorm and tornado warnings to the public and emergency managers, with revised information including reports of observed severe weather and the approximate location of the storm cell (as indicated by the most recently updated NEXRAD data ...
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.
Even though the storm system early next week is not likely to be the caboose in the train of storm systems and rounds of severe weather, it may mark the start of a change in the weather pattern.
A severe thunderstorm warning has been issued for areas at the core of Johnson County, including Iowa City, Coralville and North Liberty. The warning warns of quarter-sized hail and 60 mph winds ...
Severe weather warnings, ... Severe thunderstorms were forecast to bring high winds, hail and tornado risks. ... Ohio has already dealt with an active year with tornadoes.
The Storm Prediction Center is responsible for forecasting the risk of severe weather caused by severe thunderstorms, specifically those producing tornadoes, hail of one inch (2.5 cm) in diameter or larger, and/or winds of 58 miles per hour (93 km/h) [50 knots] or greater. The agency also forecasts hazardous winter and fire weather conditions.
Meteorologists are tracking a severe thunderstorm that has produced a tornado in western Oklahoma. Check back for live updates. Live updates: Tornado watch, severe thunderstorm alert issued in ...