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WWUS20 KWNS 290259

SEL2

SPC WW 290259

ARZ000-ILZ000-MOZ000-OKZ000-291000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 172

NWS Storm Prediction Center Norman OK

1000 PM CDT Fri Apr 28 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northwestern Arkansas

  Southern Illinois

  Southern Missouri

  Northeast and east central Oklahoma



* Effective this Friday night and Saturday morning from 1000 PM

  until 500 AM CDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2.5 inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Thunderstorms will gradually increase in coverage and

intensity in a band from southern Illinois to southern

Missouri/northwestern Arkansas and adjacent parts of eastern

Oklahoma, and the storms will persist well into the overnight hours.

Supercells will be possible within the broader area of convection,

which will locally enhance the risk for large hail and damaging

winds.  Though most of the storms will be rooted slightly above the

surface, and isolated tornado or two cannot be ruled out overnight.



The severe thunderstorm watch area is approximately along and 35

statute miles north and south of a line from 80 miles east of

Carbondale IL to 60 miles southwest of Tulsa OK. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU2).



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...



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

26035.



...Thompson

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