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ACUS11 KWNS 110341
SWOMCD
SPC MCD 110340=20
TNZ000-ALZ000-KYZ000-MSZ000-MOZ000-ARZ000-110545-

Mesoscale Discussion 1998
NWS Storm Prediction Center Norman OK
0940 PM CST Fri Dec 10 2021

Areas affected...portions of southern Arkansas into northwest
Mississippi and western Tennessee

Concerning...Tornado Watch 552...554...

Valid 110340Z - 110545Z

The severe weather threat for Tornado Watch 552, 554 continues.

SUMMARY...The severe threat continues across Tornado Watches 552 and
554. All severe hazards remain a concern and a strong tornado is
possible given the very strong low-level shear in place. Portions of
Tornado Watch 552 will be replaced by a new Tornado Watch by 05Z.

DISCUSSION...Multiple linear segments and embedded supercell
structures persist across southern into eastern AR, with marginally
severe hail reported in southern AR and a TDS recently observed via
KNQA radar data across Craighead Counnty, AR. The latest
mesoanalysis depicts the axis of a strong LLJ roughly along/just
east of the Mississippi River, which continues to transport deep
moisture into the TN Valley, as well as foster impressive low-level
shear. SHV, NQA, and GWX VWPs show relatively long, curved
hodographs with around 300 m2/s2 0-1 km SRH. As such, at least
isolated tornadoes remain possible with the more organized storms,
in addition to damaging gusts and large hail.

At the moment, there is some uncertainty if a locally higher
corridor of tornado potential exists and where. However, current
surface observations across western TN show slightly more backed
winds compared to points farther west/south, with modest pressure
falls noted. As such, the greatest chance for an additional isolated
tornado or two may be across portions of western TN, and a strong
tornado cannot be ruled out.

..Squitieri/Grams.. 12/11/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rW3VSyekH_nHel9LQxb5lwhNzbVUhpdEhqho0_gkfASHx9yvHVFGjboOcyEC4W_anh2iGyPI$=
for graphic product...

ATTN...WFO...OHX...HUN...PAH...MEG...JAN...LZK...

LAT...LON 33989332 35389139 36199021 36498866 36558712 36478703
36238689 35938702 35588721 35098752 34488840 34129016
33899140 33749249 33989332=20



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