|Mesoscale Discussion 1054|
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Mesoscale Discussion 1054
NWS Storm Prediction Center Norman OK
0515 PM CDT Mon Jun 21 2021
Areas affected...Portions of the Mid Atlantic and East Coast
Concerning...Severe Thunderstorm Watch 302...304...
Valid 212215Z - 212315Z
The severe weather threat for Severe Thunderstorm Watch 302, 304
SUMMARY...A line of thunderstorms with a history of damaging wind
gusts will track east over the next couple of hours. A continued
threat for damaging gusts appears likely before storms move offshore
DISCUSSION...2215Z radar imagery showed a line of strong/severe
thunderstorms and short bowing segments across portions of
northeastern VA, MD, and southern PA. Several reports of tree and
property damage have been received with this convective line over
the last few hours. Recent lightning and satellite trends suggests
some weakening of the line is occurring given lower flash rates and
warmer cloud tops. This is likely the result of interference from
the cooler maritime airmass near the Chesapeake Bay. However, SPC
mesoanalysis shows a broad area of locally greater buoyancy
(2000-2500 J/kg of MLCAPE) exists to the east across DE and southern
NJ. While some weakening of the ongoing line will likely continue,
damaging wind gusts from strong outflow winds will remain a threat.
Some resurgence may occur after storms cross into more favorable
thermodynamic profile east of the bay across WW302 and southern
portions of 304. This threat will continue before storms move
offshore around 00z.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 38607464 38567508 38667644 38897726 39617687 40337649
40427538 40407437 40227367 39587388 39137419 38607464
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