US Mesoscale Discussions

Storm Prediction Center Mesoscale Discussion 1694

Published Date and Time: 2026-07-21 16:46:00



Mesoscale Discussion 1694
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   Mesoscale Discussion 1694
   NWS Storm Prediction Center Norman OK
   0240 PM CDT Tue Jul 21 2026

   Areas affected...eastern Pennsylvania...New Jersey...southeast New
   York

   Concerning...Tornado Watch 507...

   Valid 211940Z - 212115Z

   The severe weather threat for Tornado Watch 507 continues.

   SUMMARY...The severe weather threat will continue through the
   afternoon.

   DISCUSSION...In the near term the greatest tornado threat will be
   across northeast New Jersey into southeast New York where a
   supercell along a warm front has continued to exhibit low-level
   rotation with several brief tornado reports. The downstream
   environment remains favorable and should maintain some damaging
   wind/tornado threat for the next 1 to 2 hours.

   Elsewhere, mid/upper level cloud cover has slowed heating and thus
   storm coverage has remained somewhat muted. However, the next round
   of storm development has begun across southeast Pennsylvania. Given
   continued filtered heating and increasing ascent through the day,
   expect additional storm development through the afternoon with a
   primary threat for damaging wind gusts.

   ..Bentley.. 07/21/2026

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...OKX...ALY...PHI...BGM...CTP...LWX...

   LAT...LON   39817737 40687656 41407541 41777387 41627304 41197274
               40807290 40407341 39657379 38997444 38697498 39067601
               39817737 

   MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


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