Mesoscale Discussion 0346
NWS Storm Prediction Center Norman OK
0333 PM CDT Mon Mar 27 2017
Areas affected...Far northeast LA...central MS...northern/central
AL...far northwest GA...far southeast TN
Concerning...Severe Thunderstorm Watch 90...
Valid 272033Z - 272200Z
The severe weather threat for Severe Thunderstorm Watch 90
continues.
SUMMARY...Threat for hail and damaging winds is expected to persist
for the next several hours across WW 90.
DISCUSSION...Numerous thunderstorms are ongoing in a corridor from
far northeast LA northeastward into far northwest GA. The overall
environment in this region is characterized by modest low-level
moisture (i.e. dewpoints in mid 50s to low 60s) and moderate shear
(effective bulk shear around 40 kt). Thunderstorm activity across
northeast AL/northwest GA continues to move northeastward/northward
towards southeast TN where cloudiness inhibited heating a bit and
temperatures are still in the mid 70s. Less favorable mid-level
lapse rates and low-level moisture also exist here, suggesting the
ongoing activity will gradually weaken. Although some isolated
severe will still be possible, current thinking is that a watch will
not be needed across this region as a result of this activity.
However, there is a chance the more organized line across middle TN
reaches this area with some increasing severe threat possible as a
result.
Farther southwest (across far northeast LA and central MS), strong
to severe multicells with a few supercells will continue to move
northeastward. Primary severe threat with this activity continues to
be hail, although damaging wind gusts are also possible. Tornado
threat remains low, owing primarily to the veered surface winds and
weakening low-level flow.
..Mosier.. 03/27/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MRX...FFC...BMX...HUN...MOB...MEG...JAN...LIX...
LAT...LON 32629178 33949083 35318483 33918466 32998617 31159112
32629178
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