|Mesoscale Discussion 1324|
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Mesoscale Discussion 1324
NWS Storm Prediction Center Norman OK
0139 PM CDT Wed Jul 21 2021
Areas affected...Parts of eastern Maryland...Delaware...southeastern
Pennsylvania...southern New Jersey...Rhode Island...southeastern
Concerning...Severe Thunderstorm Watch 385...
Valid 211839Z - 212045Z
The severe weather threat for Severe Thunderstorm Watch 385
SUMMARY...Strong thunderstorm development may still impact parts of
southeastern New England, southern New Jersey and the Delmarva
Peninsula, posing a risk for marginally severe hail and locally
damaging wind gusts through 4-6 PM EDT, while becoming more isolated
in nature elsewhere.
DISCUSSION...The eastward progression of the mid-level trough, slow
southeastward advancement of the cold front and influence of
convective outflow associated with early thunderstorm development
have increasingly confined stronger boundary-layer instability to
the Delmarva Peninsula, southern New Jersey and portions of
southeastern New England. This is generally focused south of the
the cold front into pre-frontal surface troughing, where stronger
thunderstorm development is expected to continue to increase and
tend to consolidate through 4-6 PM EDT.
Beneath cool mid-level temperatures, residual moisture may maintain
sufficient instability to support a continuing risk for additional
thunderstorm development across the remainder of the watch area to
the west and north, but this probably will be much more isolated in
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 39317638 39847607 40297525 40367428 40517320 40757202
41277154 41647208 42337058 41776958 40707023 39677034
38847134 37927433 37477525 37187586 38497670 39317638
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