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In the United States, severe thunderstorm watches are issued by the Storm Prediction Center (SPC), a national guidance center of the National Weather Service (NWS) branch of the National Oceanic and Atmospheric Administration (NOAA), [4] [5] for areas of the lower 48 states where atmospheric conditions favor the development of convective thunderstorm activity reaching severe criteria.
Parts of Texas, Mississippi and Louisiana were at risk of tornadoes and severe thunderstorms on Saturday, Dec. 28, 2024. This map from the National Weather Service's Storm Prediction Center shows ...
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]
TALLAHASSEE, Fla. – After severe thunderstorms erupted across the lower Mississippi Valley on Sunday, the threat of strong storms will shift to the Southeast and parts of Florida on Monday. Rain ...
The National Weather Service issued a severe thunderstorm watch for the Canton area until 7 p.m. today. The watch area includes Akron and Cleveland, as well as parts of Pennsylvania and West Virginia.
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"
For example, the weather service puts out a tornado watch “when severe thunderstorms and tornadoes are possible in and near the watch area.” During those times, the National Atmospheric and ...
Residents and travelers in the watch area are advised to immediately undertake safety preparations ahead of the arrival of severe weather. A tornado watch is not required for a warning to be issued; tornado warnings are occasionally issued when a tornado watch is not active (i.e., when a severe thunderstorm watch is active or if conditions for ...