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WWUS20 KWNS 311919

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URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 521

NWS Storm Prediction Center Norman OK

120 PM CST Thu Dec 31 2020



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  Southwest Louisiana

  Far southeast Texas

  Coastal Waters



* Effective this Thursday afternoon and evening from 120 PM until

  900 PM CST.



* Primary threats include...

  A few tornadoes and a couple intense tornadoes possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Squall line across the northwest Gulf through southeast

Texas should advance north-northeast, with additional cells possible

ahead of it. Low-level shear is favorable for embedded supercells

capable of producing tornadoes in addition to damaging winds with

the line.



The tornado watch area is approximately along and 65 statute miles

east and west of a line from 40 miles south southwest of

Intracoastal City LA to 20 miles northeast of Fort Polk LA. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU1).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 520...



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

surface and aloft to 1 inch. Extreme turbulence and surface wind

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

storm motion vector 19030.



...Grams

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