Mesoscale Discussion 1118
NWS Storm Prediction Center Norman OK
0224 AM CDT Thu Jun 22 2017
Areas affected...Portions of the central Gulf Coast
Concerning...Tornado Watch 362...
Valid 220724Z - 220900Z
The severe weather threat for Tornado Watch 362 continues.
SUMMARY...The threat for a few brief tornadoes may persist through
the remainder of the overnight across much of the region. New watch
issuance will be coordinated prior to the 08Z expiration of Watch
DISCUSSION...Several corridors of convective activity continue early
this morning from near the center of Tropical Storm Cindy eastward
to Alabama and the western Florida Panhandle. The easternmost
convection remains the most likely to pose a tornado threat in the
near-term, as a broad 40-45kt low-level jet maintains adequate
effective helicity for occasional mesocyclogenesis. Unlike the
previous night, a broader region of weak buoyancy exists across the
region, as the warm front advanced inland and became more diffuse
with prior diurnal heating. In turn, while the tornado threat is not
quite as focused, convection stretching from southern Alabama
southward to the Gulf may still pose a threat for a few brief
Farther west, drier mid-level air has kept convection shallower,
with little/no CG lightning noted recently. However, some westward
evolution of the low-level jet maximum may further promote renewed
activity towards daybreak from southeast Louisiana northward into
Mississippi. Adequate speed shear in the 0-1km layer and rich
moisture could yield a threat of brief tornadoes here as well.
Therefore, with Watch 362 expiring at 08Z, a new watch will be
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 29228970 29509014 31039061 31569031 32008943 32298779
32098612 31348563 30168569 29828777 29128928 29228970