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WWUS20 KWNS 070652

SEL0

SPC WW 070652

TXZ000-CWZ000-071400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 40

NWS Storm Prediction Center Norman OK

150 AM CDT Sun Apr 7 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  South central Texas

  Coastal Waters



* Effective this Sunday morning from 150 AM until 900 AM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...A cluster of thunderstorms over northeast Mexico will move

across the Rio Grande into south Texas through the early morning

hours, and the storms will become more organized with time.  The

storm environment will initially favor large hail as the main threat

with embedded supercells, but damaging winds will become more of a

threat as the storms grow into a bowing line.  An isolated tornado

or two cannot be ruled out with embedded supercell or mesovortex

circulations.



The severe thunderstorm watch area is approximately along and 70

statute miles north and south of a line from 30 miles west of Laredo

TX to 30 miles south of Victoria TX. For a complete depiction of the

watch see the associated watch outline update (WOUS64 KWNS WOU0).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Severe Thunderstorm Watch means conditions are

favorable for 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. Severe thunderstorms can and occasionally do produce

tornadoes.



&&



AVIATION...A few severe thunderstorms with hail surface and aloft to

2 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 550. Mean storm motion vector

27025.



...Thompson

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