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The tornado outlook issued by the SPC on the afternoon of December 9 (20:00 UTC) On December 5, the Storm Prediction Center issued a 5-day severe weather risk ahead of predictions that strong convective instability and wind shear would occur across portions of the Southern United States, from east Texas to western Mississippi.
Six states recorded whiteout conditions during this time. The storm continued to intensify and further severe weather in the east was forecast—more specifically, strong shortwaves from the initial trough were predicted to become robust and affect the south-southeast portions of the United States, as well as create wind-threats for the east coast.
Convective mesoscale discussions are issued by the National Oceanic and Atmospheric Administration’s Storm Prediction Center based on the National Weather Center in Norman, Oklahoma. [ 1 ] [ 2 ] One type of mesoscale discussion is a meso-gamma mesoscale discussion , which are for tornadoes believed to be at least EF2 on the Enhanced Fujita ...
The Storm Prediction Center began asking for public comment on proposed categorical additions to the Day 1-3 Convective Outlooks on April 21, 2014, for a two-month period. [24] The Storm Prediction Center broadened this system beginning on October 22, 2014 by adding two new risk categories to the three used originally.
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.
The storm system was also responsible for causing flooding in parts of the Northeast, and heavy snow over parts of the Midwest and Northern New England. The Storm Prediction Center first outlined on April 1 an enhanced risk in areas from north Texas to eastern Illinois, encompassing much of the central United States. In the afternoon hours of ...
High risk convective outlook issued by the Storm Prediction center at 16:30 UTC on March 25. On March 22, the Storm Prediction Center issued a broad 15% risk contour from Eastern Texas to the Central Gulf Coast States, highlighting the potential for multiple rounds of severe storms to move through the region.
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.