Mar 29, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook
Updated: Mon Mar 29 07:06:32 UTC 2021 (20210329 0730Z Day 3 shapefile | 20210329 0730Z Day 3 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20210329 0730 UTC Day 3 Outlook Graphic
Day 3 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
MARGINAL 235,690 35,360,281 Charlotte, NC...New Orleans, LA...Atlanta, GA...Raleigh, NC...Greensboro, NC...
Probabilistic Graphic
20210329 0730 UTC Day Probabilitic Graphic
Probability of severe weather within 25 miles of a point.
Hatched Area: 10% or greater probability of significant severe within 25 miles of a point.
Day 3 Prob. Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
5 % 234,346 35,213,300 Charlotte, NC...New Orleans, LA...Atlanta, GA...Raleigh, NC...Greensboro, NC...
   SPC AC 290706

   Day 3 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0206 AM CDT Mon Mar 29 2021

   Valid 311200Z - 011200Z

   ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
   THE WESTERN GULF COAST...SOUTHEAST...SOUTHERN
   APPALACHIANS...CAROLINAS AND VIRGINIA...

   ...SUMMARY...
   Thunderstorm development will be possible on Wednesday from the
   western Gulf Coast northeastward into the Carolinas and Virginia.
   Strong wind gusts and hail will be the primary threats.

   ...Western Gulf Coast/Southeast/Southern
   Appalachians/Carolinas/Virginia...
   An upper-level trough is forecast to move eastward across the
   central U.S. on Wednesday. At the surface, a cold front is forecast
   to advance southeastward into the southeastern U.S. being positioned
   form the western Gulf Coast to the southern Appalachians by midday.
   As surface temperatures warm during the day, pockets of weak
   instability are expected to develop, with surface dewpoints ahead of
   the front in the lower to mid 60s F. Increasing instability and
   low-level convergence along and just ahead of the front will likely
   result in thunderstorm development during the afternoon. Near the
   front, deep-layer shear is forecast to be in the 45 to 55 kt range.
   This combined with steep low-level lapse rates will make isolated
   damaging wind gusts a possibility. Hail could also occur with the
   stronger cores. Any severe threat is expected to be marginal and
   confined to the mid to late afternoon when surface temperatures will
   be maximized.

   ..Broyles.. 03/29/2021

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