Severe Storm Outlook Narrative (AC)
Issued by NWS
ACUS11 KWNS 211235
SPC MCD 211235
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.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 29699125 30328981 30808903 31388838 29898828 28898868
28658936 28879010 28839089 28899124 29699125