Usually, if a thunderstorm is producing only weak rotation, it will only yield hazardous weather warranting a severe thunderstorm warning. If a tornado warning is issued, based on Doppler weather radar, it means strong rotation has been detected within a thunderstorm. Generally, but not always, a severe thunderstorm watch or tornado watch (or a regional equivalent thereof) will precede a warning. If a tornado is detected on radar or is sighted visually, a tornado warning will be issued either in replacement of or concurrently to the existing severe thunderstorm warning. While not all severe thunderstorms produce tornadoes, they can produce serious straight line wind damage as severe as a lower-category tornado or hurricane, and can actually cover a much wider area than that exceeded by a tornado's comparatively relative narrow path width. Severe thunderstorms can and do produce tornadoes without warning. Definition Ī severe thunderstorm warning indicates the warned area is in impending danger from hail or wind speeds meeting warning criteria as well as from lightning and hydrological impacts associated with the storm cell. Others may instead issue a flood advisory or a flash flood warning in that case. Most forecasting agencies have similar criteria, but some agencies, such as Environment Canada, also include high rainfall rate. In the United States, the National Weather Service issues a warning when an observed thunderstorm is producing wind gusts of at least 58 miles per hour (93 km/h), or hail of at least 1 inch (2.5 cm) in diameter. The exact criteria to issue a warning varies from country to country. Severe thunderstorms can cause property damage and injury due to large hail, high winds, and flooding due to torrential rainfall. Unlike a watch, a warning is issued to areas in the direct path of active severe thunderstorms, that are expecting a direct impact typically within an hour. Clouds from a dissipating severe thunderstorm.Ī severe thunderstorm warning ( SAME code: SVR) is a type of public warning for severe weather that is issued by weather forecasting agencies worldwide when one or more severe thunderstorms have been detected by Doppler weather radar, observed by weather spotters, or reported by an emergency management agency, law enforcement, or the general public.
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