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An example of a tornado watch for parts of Kansas and Nebraska, issued by the Storm Prediction Center on May 5, 2007.. A tornado watch (SAME code: TOA) 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 tornadoes within (or near) the region over several hours.
A tornado warning ( SAME code: TOR) is a public warning that is issued by weather forecasting agencies to an area in the direct path of a tornado, or a thunderstorm capable of producing one, and advises individuals in that area to take cover. Modern weather surveillance technology such as Doppler weather radar can detect rotation in a ...
Severe thunderstorm warning (SVR) – A severe thunderstorm is indicated by Doppler weather radar or sighted by Skywarn spotters or other persons, such as local law enforcement. A severe thunderstorm contains large damaging hail of 1 inch (2.5 cm) in diameter or larger, and/or damaging winds of 58 mph (93 km/h) or greater.
After that, the thunderstorms continued to produce hail and high winds across much of Georgia and South Carolina, causing the NWS to issue more severe thunderstorm warnings and another tornado watch until 11:30 PM (EST). Elsewhere, thunderstorms also spawned numerous reports of tornadoes, hail and high winds in Kentucky, Indiana.
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.
1965 Palm Sunday tornado outbreak. On April 10–12, 1965, a historic severe weather event affected the Midwestern and Southeastern United States. The tornado outbreak produced 55 confirmed tornadoes in one day and 16 hours. The worst part of the outbreak occurred during the afternoon hours of April 11 into the overnight hours going into April 12.
High risk convective outlook issued by the Storm Prediction center at 13:00 UTC on May 6 May 6. Starting April 30, the Storm Prediction Center noted that certain models, including the ECMWF, forecasted a multi-day period of high instability and supportive wind shear across the Southern and Central Plains, and by May 1, a 15% risk was added across Nebraska, Kansas, Oklahoma, and northern Texas.
The aforementioned area was given a level 3/enhanced risk for severe weather, with a 10% risk for EF2+ tornadoes situated mainly in the area within Oklahoma and Arkansas. In this area, convective available potential energy (CAPE) values reached 2,500–3,000 J/kg, favorable wind shear was present, and elongated, curved hodograph values were ...
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