SPC MD 1671

MD 1671 CONCERNING SEVERE THUNDERSTORM WATCH 484... FOR MARYLAND...DELAWARE...SOUTHEAST PENNSYLVANIA...SOUTHERN NEW JERSEY

Mesoscale Discussion 1671
NWS Storm Prediction Center Norman OK
0720 PM CDT Wed Sep 02 2020

Areas affected...Maryland...Delaware...southeast
Pennsylvania...southern New Jersey

Concerning...Severe Thunderstorm Watch 484...

Valid 030020Z - 030215Z

The severe weather threat for Severe Thunderstorm Watch 484
continues.

SUMMARY...Strong wind gusts remain possible across watch 484.

DISCUSSION...A line of storms has consolidated from southeast PA
into central MD, moving east at around 30 kt which is close to the
mean midlevel wind speeds as seen on the 00Z IAD sounding. Storms
are also currently near the instability axis of 1500 J/kg MLCAPE,
and thus should maintain intensity for an hour or two. While some
eastward-advection of instability is expected due to westerly 850 mb
winds, time of day will work against much destabilization across NJ
and DE where MLCAPE is less than 1000 J/kg.

..Jewell.. 09/03/2020

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

ATTN...WFO...PHI...AKQ...CTP...LWX...

LAT...LON   38967742 39307705 39677672 39997663 40287649 40507557
            40337501 39847481 39137495 38777535 38587597 38557670
            38707728 38817738 38967742 

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