Dec 8, 2021 0600 UTC Day 1 Convective Outlook
Updated: Wed Dec 8 05:01:19 UTC 2021 (20211208 1200Z Day 1 shapefile | 20211208 1200Z Day 1 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20211208 1200 UTC Day 1 Outlook Graphic
Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
Probabilistic Tornado Graphic
20211208 1200 UTC Day 1 Tornado Probabilities Graphic
Probability of a tornado within 25 miles of a point.
Hatched Area: 10% or greater probability of EF2 - EF5 tornadoes within 25 miles of a point.
Day 1 Tornado Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
Probabilistic Damaging Wind Graphic
20211208 1200 UTC Day 1 Damaging Wind Probabilities Graphic
Probability of damaging thunderstorm winds or wind gusts of 50 knots or higher within 25 miles of a point.
Hatched Area: 10% of greater probability of wind gusts 65 knots or greater within 25 miles of a point.
Day 1 Wind Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
Probabilistic Large Hail Graphic
20211208 1200 UTC Day 1 Large Hail Probabilities Graphic
Probability of hail 1" or larger within 25 miles of a point.
Hatched Area: 10% or greater probability of hail 2" or larger within 25 miles of a point.
Day 1 Hail Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
   SPC AC 080501

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1101 PM CST Tue Dec 07 2021

   Valid 081200Z - 091200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Severe thunderstorm probabilities are low across the contiguous
   United States today and tonight.

   ...Synopsis...

   A large-scale upper trough extending from the upper Great Lakes
   toward the Deep South will pivot eastward to the lower Great Lakes
   and southeast U.S. coast by late afternoon. At the surface, a cold
   front is forecast to extend from southern SC/GA to the northern Gulf
   of Mexico this morning, sagging south/southeast into northern FL by
   early evening. While a moist warm sector will be in place ahead of
   the front across far southern GA/northern FL, poor midlevel lapse
   rates and limited surface heating will preclude strong
   destabilization. Nevertheless, strong effective shear magnitudes
   greater than 35 kt are forecast. This could aid in the development
   of a couple of briefly stronger cells, especially if greater
   destabilization can occur. Some gusty winds could accompany these
   storms, but overall severe potential appears too low/conditional to
   include probabilities at this time.

   ..Leitman/Weinman.. 12/08/2021

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   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z