|Mesoscale Discussion 87|
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Mesoscale Discussion 0087
NWS Storm Prediction Center Norman OK
0635 AM CST Sat Jan 21 2017
Areas affected...Extreme southeast Mississippi and southeast
Concerning...Tornado Watch 10...
Valid 211235Z - 211330Z
The severe weather threat for Tornado Watch 10 continues.
SUMMARY...Locally strong wind gusts should be the primary
severe-weather threat within the remaining valid area of WW 10
(across southeast Louisiana and extreme southeast Mississippi) until
13Z. However, given strong low-level shear, a tornado threat cannot
be ruled out.
DISCUSSION...At 12Z, mosaic radar imagery and trends in surface
mesoanalyses indicated a well-defined comma head/mesolow had moved
into west-central Alabama and was located from Marengo to Sumter
Counties. This low is associated with a progressive shortwave
trough expected to move into Alabama through this morning with the
expected downstream northward transport of mid-upper 60s F dew
points well underway across southern Alabama into west-central
Georgia. Meanwhile, mosaic radar imagery also indicated a trailing
band of strong to occasionally severe storms extending from the
mesolow through extreme southeast Mississippi to southeast
Louisiana. Low-level winds per LIX 12Z sounding and WSR-88D VWP
data have begun to veer to southwesterly, becoming parallel to the
trailing band of storms. This will continue to limit low-level
convergence into these east-southeastward-moving storms, with a
gradual diminishing trend in a severe-weather threat through 13Z
across the remaining portion of WW 10.
LAT...LON 29699125 30328981 30808903 31388838 29898828 28898868
28658936 28879010 28839089 28899124 29699125
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