Sep 4, 2020 0100 UTC Day 1 Convective Outlook
Updated: Fri Sep 4 00:42:02 UTC 2020 (20200904 0100Z Day 1 shapefile | 20200904 0100Z Day 1 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20200904 0100 UTC Day 1 Outlook Graphic
Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 12,279 12,724,120 Philadelphia, PA...Elizabeth, NJ...Toms River, NJ...Edison, NJ...Trenton, NJ...
MARGINAL 41,137 25,879,680 New York, NY...San Antonio, TX...Baltimore, MD...Washington, DC...Newark, NJ...
Probabilistic Tornado Graphic
20200904 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 % 3,338 691,750 Atlantic City, NJ...Dover, DE...Millville, NJ...Pleasantville, NJ...Ocean City, NJ...
2 % 8,884 12,066,377 Philadelphia, PA...Elizabeth, NJ...Toms River, NJ...Edison, NJ...Trenton, NJ...
Probabilistic Damaging Wind Graphic
20200904 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 % 12,213 12,570,945 Philadelphia, PA...Elizabeth, NJ...Toms River, NJ...Edison, NJ...Trenton, NJ...
5 % 41,228 26,037,016 New York, NY...San Antonio, TX...Baltimore, MD...Washington, DC...Newark, NJ...
Probabilistic Large Hail Graphic
20200904 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
5 % 12,278 12,846,276 Philadelphia, PA...Elizabeth, NJ...Toms River, NJ...Edison, NJ...Trenton, NJ...
   SPC AC 040042

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0742 PM CDT Thu Sep 03 2020

   Valid 040100Z - 041200Z

   ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
   THE MID-ATLANTIC...

   ...SUMMARY...
   Damaging winds and perhaps a tornado will be possible across parts
   of the Mid-Atlantic this evening. A few strong wind gusts will be
   possible across parts of south-central Texas.

   ...Mid-Atlantic...
   The latest radar imagery a cluster of strong thunderstorms ongoing
   from Maryland northeastward into New Jersey. The storms are located
   on the northern edge of moderate instability. A shortwave trough is
   evident on water vapor imagery across the Mid-Atlantic. These two
   factors may maintain thunderstorm intensity for another hour or two
   before the convection moves offshore. The DIX WSR-88D VWP in New
   Jersey has 0-6 km shear near 50 kt with strong low-level shear. This
   may be enough to continue a tornado threat with the stronger storms
   as they approach the Atlantic coast over the next hour or so. Wind
   damage could also accompany the more intense cells.

   ...South-central Texas...
   Scattered thunderstorms are ongoing across parts of south-central
   and southwest Texas early this evening. The storms are located on
   the northern edge of a gradient of strong instability. RAP analysis
   shows 0-3 km lapse rates near 7.5 C/km. This combined with the
   instability may be enough for a few strong wind gusts for a couple
   more hours this evening. However, much of the convection is located
   behind an outflow boundary, so any severe threat should be marginal.

   ..Broyles.. 09/04/2020

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