|Mesoscale Discussion 1062|
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Mesoscale Discussion 1062
NWS Storm Prediction Center Norman OK
0619 PM CDT Fri Jun 16 2017
Areas affected...much of mississippi...western
Alabama...northeastern louisiana...and far southeastern arkansas
Concerning...Severe Thunderstorm Watch 338...
Valid 162319Z - 170015Z
The severe weather threat for Severe Thunderstorm Watch 338
SUMMARY...The severe threat continues across central/southern
portions of WW 338, and a damaging wind threat may eventually impact
western Alabama over the next hour or so.
DISCUSSION...A couple of linear, forward propagating thunderstorm
segments have evolved over WW 338 - 1) moving southward across the
Mississippi Delta toward west-central Mississippi and 2) another
migrating slowly southeastward across east-central Mississippi.
Both of these complexes are capable of localized damaging wind gusts
and perhaps marginally severe hail owing to moderate instability
(3000-4000 J/kg MUCAPE) within the pre-convective airmass ahead of
the storms. Deep shear is a bit stronger with western extent, which
may partially explain the faster southward propagation with the
western Mississippi segment.
Storms will likely begin to impact areas just east of WW 338 over
the next 30 minutes or so, with a localized damaging wind threat
continuing with this activity. The probability of a new downstream
watch is relatively low, however, as this threat should be fairly
confined to a small part of far western Alabama. Damaging wind
gusts and hail are also possible along and just east of the
Mississippi River through at least dark. Farther north, overturning
and attendant low-level stabilization has lessened the severe threat
such that portions of WW 338 may be cancelled early - particularly
in northeastern Mississippi.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 33919137 34009100 33989022 34108970 34358920 34678869
34698845 34488820 34098783 33608737 33138719 32468723
32048733 31378765 30868808 30828853 30898920 30999002
31189066 31299118 31329160 31419183 31779189 32289185
32919196 33349192 33609170 33919137
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