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Mesoscale Discussion 1653 |
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Mesoscale Discussion 1653
NWS Storm Prediction Center Norman OK
0351 PM CDT Mon Aug 30 2021
Areas affected...Portions of the Mid-Atlantic into central Virginia
Concerning...Severe potential...Watch unlikely
Valid 302051Z - 302215Z
Probability of Watch Issuance...5 percent
SUMMARY...Scattered thunderstorms ongoing may be capable of a
damaging gust or two into this evening. Given low
coverage/organization a weather watch is not expected.
DISCUSSION...As of 2035 UTC, regional radar showed several clusters
of thunderstorms ongoing across the Mid Atlantic and Virginia. These
storms were located on the periphery of surface high pressure where
SPC mesoanalysis showed warm temperatures and dewpoints in the 60s
and 70s F were contributing to 2000-2500 J/kg of MLCAPE. Vertical
shear remains quite weak with less than 20 kt depicted from regional
VWPs. Thus, many of these storms have exhibited limited organization
with a primarily multicell/pulse storm mode. However,
temperature/dewpoint spreads near 25 degrees F may support a few
stronger downdrafts capable of damaging wind gusts this afternoon
and early evening. As storms continue to move to the south and east,
gradual weakening is expected as diurnal heating diminishes. Given
the limited potential for organized severe weather, a watch is not
expected. However, a few strong wind gusts may occur.
..Lyons/Grams.. 08/30/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PHI...AKQ...LWX...RNK...
LAT...LON 37607951 38597847 39377670 39757567 39957482 39417490
39017537 38687596 38247677 37817719 37557738 37337757
37257805 37217864 37267928 37297948 37607951
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