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WWUS20 KWNS 232053

SEL7

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OKZ000-TXZ000-240300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 207

NWS Storm Prediction Center Norman OK

355 PM CDT Sat Jun 23 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Parts of central and western Oklahoma

  Extreme northwest Texas



* Effective this Saturday afternoon and evening from 355 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Thunderstorm development is expected in the next couple of

hours along a stalled boundary near I-40, from the southern Oklahoma

City metro area westward.  The storm environment favors supercells

capable of producing very large hail and damaging winds.  A modest

increase in low-level shear this evening could also support the

threat for an isolated tornado, though this threat is secondary to

the hail and wind.  Some clustering of storms and southward

movement/development will be possible later this evening across the

southern portions of the watch area.



The severe thunderstorm watch area is approximately along and 50

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

of Clinton OK to 50 miles north northeast of Ardmore OK. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU7).



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 205...WW 206...



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 600. Mean storm motion vector

30015.



...Thompson

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