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WWUS20 KWNS 220454

SEL7

SPC WW 220454

ARZ000-MOZ000-OKZ000-TXZ000-221200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 507

NWS Storm Prediction Center Norman OK

1155 PM CDT Sat Oct 21 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western Arkansas

  Southern Missouri

  Far Southeast Oklahoma

  Northeast Texas



* Effective this Saturday night and Sunday morning from 1155 PM

  until 700 AM CDT.



* Primary threats include...

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Linear bands of storms will continue to steadily move

generally eastward through the early morning hours. Locally damaging

winds will be the primary hazard, but a brief tornado cannot be

entirely ruled out with line-embedded circulations amidst strong

low-level shear.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 45 miles east northeast

of Springfield MO to 50 miles southwest of Texarkana AR. 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 504...WW 505...WW 506...



AVIATION...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 500. Mean storm motion vector

27030.



...Guyer

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