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ACUS11 KWNS 240123
SWOMCD
SPC MCD 240123
ALZ000-TNZ000-MSZ000-240330-

Mesoscale Discussion 0847
NWS Storm Prediction Center Norman OK
0823 PM CDT Sat Jun 23 2018

Areas affected...Northern Alabama...southern Middle Tennessee

Concerning...Tornado Watch 208...

Valid 240123Z - 240330Z

The severe weather threat for Tornado Watch 208 continues.

SUMMARY...A few of the stronger storms, particularly in northern
portions of WW 208, will continue to pose a tornado threat for the
next hour or two.

DISCUSSION...Two clusters of storms have persisted in WW 208 -- one
in south-central Tennessee and another in northern/central Alabama.
With effective deep-layer shear values from 25-35 kts, storms have
been able to maintain marginal supercellular structure. VWP data
shows favorable low-level hodograph curvature and 20-25 kts of 0-1
km shear for KHTX. 0-1 km shear decreases with southward extend per
KGWX VWP showing around 10 kts.

The area of greatest tornado threat for the next few hours appears
to be southern Middle Tennessee and parts of northwestern Alabama. A
storm along Wayne County, TN and Lauderdale County, AL has shown
stronger mid-level rotation and exhibited rightward deviant storm
over the last half hour. Furthermore, deep-layer shear should remain
stronger in this area, due to proximity to a weak mid-level wave, as
well as better low level shear. Storms moving south into central
Alabama should become more disorganized with time as shear decreases
to the south. The overall threat should diminish as continued
boundary layer cooling will increase convective inhibition.

..Wendt.. 06/24/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...OHX...BMX...HUN...MEG...

LAT...LON 35428795 35368705 35168632 34648622 34088623 33828678
33648741 33588796 33608821 34188818 34888810 35318800
35428795



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