Dec 25, 2020 0100 UTC Day 1 Convective Outlook
Updated: Fri Dec 25 00:30:14 UTC 2020 (20201225 0100Z Day 1 shapefile | 20201225 0100Z Day 1 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20201225 0100 UTC Day 1 Outlook Graphic
Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 61,176 9,315,320 Virginia Beach, VA...Raleigh, NC...Norfolk, VA...Chesapeake, VA...Durham, NC...
MARGINAL 84,016 30,318,671 Philadelphia, PA...Jacksonville, FL...Baltimore, MD...Washington, DC...Tampa, FL...
Probabilistic Tornado Graphic
20201225 0100 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
5 % 61,327 9,327,410 Virginia Beach, VA...Raleigh, NC...Norfolk, VA...Chesapeake, VA...Durham, NC...
2 % 51,147 18,192,741 Jacksonville, FL...Baltimore, MD...Washington, DC...Tampa, FL...St. Petersburg, FL...
Probabilistic Damaging Wind Graphic
20201225 0100 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
15 % 61,184 9,317,472 Virginia Beach, VA...Raleigh, NC...Norfolk, VA...Chesapeake, VA...Durham, NC...
5 % 83,975 30,373,871 Philadelphia, PA...Jacksonville, FL...Baltimore, MD...Washington, DC...Tampa, FL...
Probabilistic Large Hail Graphic
20201225 0100 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 250030

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0630 PM CST Thu Dec 24 2020

   Valid 250100Z - 251200Z

   ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE EASTERN
   CAROLINAS INTO SOUTHEAST VIRGINIA...

   ...SUMMARY...
   Severe risk -- which includes potential for locally damaging winds
   and a few tornadoes -- continues across portions of the Carolinas
   and Mid-Atlantic region, and to a lesser degree southward into
   Florida.

   ...01z Update...

   Strong 500mb speed max appears to have translated through the base
   of the eastern US trough and will eject across GA into VA later
   tonight. Cold front associated with this feature is beginning to
   surge east across western NC/SC at roughly 35kt. While the majority
   of deep convection with lightning is observed ahead of this wind
   shift, will maintain severe probabilities along/ahead of the
   synoptic frontal zone. Given the latest trends, will continue a SLGT
   Risk downstream across Coastal NC/SC into southeast VA where
   buoyancy remains greatest in association with mid 60s surface dew
   points. Very strong flow just off the surface remains conducive for
   strong wind gusts if augmented by minimal convective contribution.
   Shear is also impressive across the warm sector so damaging winds
   and some tornado threat remain until the front moves offshore.

   ..Darrow.. 12/25/2020

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   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0600Z