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57: 1984 Carolinas tornado outbreak – Twenty-four tornadoes were confirmed; seven were rated F4. In addition to the 57 tornadic deaths, 1,249 people were injured. This was and remained the deadliest official High Risk day (since SELS/SPC High Risk outlooks began) for over 27 years, surpassed by the Super Outbreak of April 27, 2011.
The SPC anticipated that the atmospheric environment over eastern Nebraska and western Iowa would become increasingly conducive for further organization of these storms into supercells. [37] A tornado watch was issued by the SPC for areas near and along the Nebraska–Iowa border region at 11:10 a.m. CDT in anticipation of these changes. [38]
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]
Probabilities for tornadoes, hail and wind applying to the Day 1 Convective Outlook were incorporated into the Day 2 Convective Outlook on January 28, 2020, citing research to SPC operations and improvements in numerical forecast guidance that have increased forecaster confidence in risk estimation for those hazards in that timeframe.
NWS Tornado outlooks from June 14–19 overlaid. On June 12, the Storm Prediction Center (SPC) issued a level 3/enhanced risk of severe weather for June 14 across the Mid-South and eastern Gulf Coast states, and also highlighted the threat for significant severe weather across the risk area. [7]
By March 30, the Storm Prediction Center (SPC) introduced a moderate risk for severe weather for two distinct regions in the northern and southern sections of the main risk area, where significant, long-tracked tornadoes were expected. In this outlook, the SPC discussed the presence of very high CAPE values reaching into the 1,000–1500 J/kg ...
SPC tornado outlook for the morning of January 12 (13:00 UTC) Afternoon outlook update for the evening of January 12 (20:00 UTC) On January 11, the Storm Prediction Center outlined a level 1/Marginal risk across the Mid-South valid for the overnight and early morning hours.
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.