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WWUS20 KWNS 311745

SEL9

SPC WW 311745

ALZ000-MSZ000-TNZ000-010100-



URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 449

NWS Storm Prediction Center Norman OK

1145 AM CST Mon Dec 31 2018



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  Western and northern Alabama

  Central and Eastern Mississippi

  Western and Middle Tennessee



* Effective this Monday morning and evening from 1145 AM until

  700 PM CST.



* Primary threats include...

  A couple tornadoes possible

  Isolated damaging wind gusts to 70 mph possible



SUMMARY...An increasingly well-organized squall line is expected to

race east-northeastward across parts of the region, with other

potentially more isolated storms ahead of the line across

Mississippi into western/northern Alabama. Although the air mass is

not overly unstable, very strong low-level/deep-layer winds will

support bowing segments along with embedded mesovortices capable of

wind damage and some tornado risk. The overall severe risk should

wane by early evening in most areas.



The tornado watch area is approximately along and 60 statute miles

east and west of a line from 35 miles north northwest of Nashville

TN to 65 miles south southeast of Jackson MS. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU9).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Tornado Watch means conditions are favorable for

tornadoes and severe thunderstorms in and close to the watch

area. Persons in these areas should be on the lookout for

threatening weather conditions and listen for later statements

and possible warnings.



&&



AVIATION...Tornadoes and a few severe thunderstorms with hail

surface and aloft to 0.5 inches. Extreme turbulence and surface wind

gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean

storm motion vector 23040.



...Guyer

