Weather warning indicating an observed severe thunderstorm
Not to be confused with Severe thunderstorm watch.
This article contains too many or overly lengthy quotations. Please help summarize the quotations. Consider transferring direct quotations to Wikiquote or excerpts to Wikisource.(December 2019)
Severe thunderstorm with a clear slot near main updraft core. Typically a tornado, if present, will form in this area. This is called a Rear Flank Downdraft and can be a sign of tornado genesis.Clouds from a dissipating severe thunderstorm.
A 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. 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. Severe thunderstorms can cause property damage and injury due to large hail, high winds, and flooding due to torrential rainfall. The exact criteria to issue a warning varies from country to country.
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. Most forecasting agencies have similar criteria, but some agencies, such as Environment Canada, also include high rainfall rate. Others may instead issue a flood advisory or a flash flood warning in that case.[1]
^Cite error: The named reference Warningdefinition was invoked but never defined (see the help page).
and 25 Related for: Severe thunderstorm warning information
A severethunderstormwarning (SAME code: SVR) is a type of public warning for severe weather that is issued by weather forecasting agencies worldwide...
effect), if a severethunderstorm develops and has a confirmed tornado or strong rotation. The first official tornado forecast—and tornado warning—was made...
mesoscale convective system. A severethunderstorm watch, like a tornado watch, is not to be confused with a warning. A watch encourages the public to...
flood warning was issued similar to a PDS flood warning stating "...This is a dangerous and life-threatening situation..." A severethunderstormwarning bulletin...
wind warning is not issued if a tropical storm warning, blizzard warning, winter storm warning, severethunderstormwarning, dust storm warning, or tornado...
weather warnings in Australia. The Bureau's warnings can be separated into severethunderstormwarnings and severe weather warnings. Severethunderstorm warnings...
needed] On December 30, 2019, a severethunderstormwarning was issued for parts of Massachusetts for a thunderstorm cell that was producing "lightning...
tornado of strength EF2 or stronger. Both severe and significant severe events warrant a severethunderstormwarning from the United States National Weather...
The exception to this convention is for "TOR" (tornado warning), "SVR" (severethunderstormwarning), "EVI" (evacuation immediate), "EAN, EAT, NIC" (the...
severe weather. If severe weather actually does occur, a severethunderstormwarning or tornado warning would then be issued. Residents and travelers in the...
10 tornado warnings and 5 severethunderstormwarnings between 1 and 5 p.m. on May 27. The Austin/San Antonio office issued 8 tornado warnings, 24 severe thunderstorm...
issues a severethunderstorm watch for the Red Deer area, including Pine Lake. 6:18 PM MDT – watch upgraded to a severethunderstormwarning, indicating...
a severethunderstormwarning at 10:25 am. Severethunderstorm watches for the London area followed at 10:41 am, upgraded to a severethunderstorm warning...
board, leaving 17 dead, during high winds associated with nearby severethunderstorms as part of a significant derecho and tornado outbreak. The DUKW ("Duck"...
a severethunderstormwarning was issued on the quickly organizing storm for Parker County. About an hour later, another severethunderstormwarning was...
display features of a typical severe storm. Because of this, the National Weather Service issued only a SevereThunderstormWarning prior to the tornado which...
April 27, the supercell thunderstorm began to re-intensify in northeastern Alabama. Initially, a severethunderstormwarning was issued for the region...
perceived little impact. As of August 2, 2021, NWS has added SevereThunderstormWarnings labeled with a “destructive” damage threat, for wind gusts over...
(supercellular) measurements has allowed forecasters to issue severethunderstorm and tornado warnings in more timely fashion and with a higher probability of...
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...
the warning, called extreme red flag warning. Analogous to the particularly dangerous situation (PDS) wording on a high-end severe weather warning or watch...
Global Information
