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Mesoscale Discussion 1317
NWS Storm Prediction Center Norman OK
0446 PM CDT Wed Jul 22 2020
Areas affected...much of West Virginia
Concerning...Severe potential...Watch unlikely
Valid 222146Z - 222315Z
Probability of Watch Issuance...20 percent
SUMMARY...An MCS was migrating eastward across the discussion at
around 35-40 knots. This complex will bring strong to potentially
damaging wind gusts to the Charleston vicinity over the next hour
and the remainder of the MD area over the next couple hours.
DISCUSSION...A well-organized, forward-propagating MCS has migrated
into western portions of the state of West Virginia recently. The
downstream airmass is only weakly sheared, though the organization
of the MCS suggests that storm-scale processes may contribute to
gusty winds especially on the leading edge of the convection.
Moderate instability exists downstream of the MCS (MUCAPE ranging
from 2000-3000 J/kg amidst low 90s F surface temperatures and 60s F
dewpoints), which should maintain the MCS through at least dark. On
its current eastward track (around 35-40 knots forward motion), the
complex will migrate through the Charleston, WV vicinity over the
next hour and through the remainder of the MD area over the next 2-3
hours, posing a continued isolated damaging-wind gust risk through
sunset. The isolated nature of the threat precludes a WW issuance,
however.
..Cook/Grams.. 07/22/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LWX...RNK...RLX...JKL...
LAT...LON 39168199 39188040 38887974 38207956 37717995 37408082
37458189 37708246 38018272 38468252 38728229 39168199
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