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Tornado emergency. A tornado emergency is an enhanced version of a tornado warning, which is used by the National Weather Service (NWS) in the United States during imminent, significant tornado occurrences in highly populated areas. Although it is not a new warning type from the NWS, issued instead within a severe weather statement or in the ...
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 several hours. The criteria for issuing a watch varies from country to country and may also ...
Katwarn (also known as KATWARN) is an alert and information system that informs the affected citizen in disasters and dangerous situations (e.g. large fires, power outages, bomb finds ). Since 2011, Katwarn has been in use in Germany in various cities, counties and city states, as well as at the state (Bundesländer) and federal level.
J-Alert was launched in February 2007. The system is designed to quickly inform the public of threats and emergencies such as earthquakes, severe weather, and other dangers. The system was developed in the hope that early warnings would speed up evacuation times and help coordinate emergency response.
Since its initial usage in May 1999, the National Weather Service (NWS) in the United States has used the tornado emergency bulletin, an unofficial, high-end classification of tornado warning—sent through either the issuance of a warning or via a "severe weather statement" that provides updated information on an ongoing warning—that is issued when a violent tornado (confirmed by radar or ...
A special marine warning ( SAME code SMW) is a warning issued by the U.S. National Weather Service for potentially hazardous marine weather conditions usually of short duration (up to 2 hours) producing sustained marine thunderstorm winds or associated gusts of 34 knots or greater; or hail 3/4 inch or more in diameter; or waterspouts affecting ...
2011 Super Outbreak. The 2011 Super Outbreak was the largest, costliest, and one of the deadliest tornado outbreaks ever recorded, taking place in the Southern, Midwestern, and Northeastern United States from April 25 to 28, 2011, leaving catastrophic destruction in its wake.
On 21 May 2022, a broadcast intrusive alert was issued for a derecho in Ontario and Quebec (identified as a severe thunderstorm warning) under these criteria for the first time. Alerts issued. The following is the total number of emergency alert messages issued by Canadian government authorities through Alert Ready.
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