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WWUS20 KWNS 290333

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 173

NWS Storm Prediction Center Norman OK

1035 PM CDT Fri Apr 28 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central and southwest Oklahoma

  Parts of northwest Texas and the southeast Texas Panhandle



* Effective this Friday night and Saturday morning from 1035 PM

  until 600 AM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter likely

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Severe storm development is expected in the next couple of

hours across the southeast Texas Panhandle and adjacent southwest

Oklahoma.  The initial storms could be supercells capable of

producing very large hail.  A gradual transition to more

cluster/linear modes is expected in the early morning hours, with

some increase in the damaging wind threat into central Oklahoma.

While the near-surface layer is a bit stable, a tornado or two

cannot be ruled out.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 20 miles north

northwest of Childress TX to 15 miles east southeast of Chandler OK.

For a complete depiction of the watch see the associated watch

outline update (WOUS64 KWNS WOU3).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 170...WW 171...WW 172...



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

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

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

25035.



...Thompson

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