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WWUS20 KWNS 311336

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URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 520

NWS Storm Prediction Center Norman OK

740 AM CST Thu Dec 31 2020



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  The upper Texas coastal plain

  Coastal Waters



* Effective this Thursday morning and afternoon from 740 AM until

  300 PM CST.



* Primary threats include...

  A few tornadoes possible

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1 inch in diameter possible



SUMMARY...Thunderstorms will increase in coverage and intensity

through the morning while spreading inland across the upper Texas

coast.  The storm environment will gradually become more favorable

for supercells inland, with an attendant threat for a few tornadoes

and damaging winds through early to mid afternoon.



The tornado watch area is approximately along and 40 statute miles

north and south of a line from 25 miles west southwest of Angleton

TX to 20 miles north northeast of Port Arthur TX. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU0).



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 1 inch. Extreme turbulence and surface wind

gusts to 60 knots. A few cumulonimbi with maximum tops to 400. Mean

storm motion vector 21035.



...Thompson

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