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Day 1 Convective Outlook and probabilistic maps issued by the Storm Prediction Center on May 20, 2019 depicting a high risk day. The top map indicates the risk of general severe weather (including large hail , damaging winds, and tornadoes), while the bottom map specifically shows the risk percentage of a tornado forming within 25 miles (40 km ...
Convective storm detection is the meteorological observation, and short-term prediction, of deep moist convection (DMC). DMC describes atmospheric conditions producing single or clusters of large vertical extension clouds ranging from cumulus congestus to cumulonimbus , the latter producing thunderstorms associated with lightning and thunder .
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.
A mesoscale convective complex (MCC) is a unique kind of mesoscale convective system which is defined by characteristics observed in infrared satellite imagery. Their area of cold cloud tops exceeds 100,000 square kilometres (39,000 sq mi) with temperature less than or equal to −32 °C (−26 °F); and an area of cloud top of 50,000 square ...
A mesoscale convective complex (MCC) is a unique kind of mesoscale convective system which is defined by characteristics observed in infrared satellite imagery. They are long-lived, often form nocturnally, and commonly contain heavy rainfall , wind , hail , lightning , and possibly tornadoes .
High risk convective outlook issued by the Storm Prediction center at 13:00 UTC on 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, [10] and by May 1, a 15% risk was added across Nebraska, Kansas, Oklahoma, and northern Texas. [11]
SPC's Day 1 convective outlook for May 16, 2024, issued at 2000Z, indicating an enhanced risk for severe weather from southeast Texas into southwest Louisiana.. On May 14, the Storm Prediction Center (SPC) outlined a level 2/Slight risk for severe weather across portions of central and northern Texas. [11]
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.