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WWUS20 KWNS 191936

SEL7

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ILZ000-MOZ000-200300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 287

NWS Storm Prediction Center Norman OK

240 PM CDT Sat Jun 19 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  West Central Illinois

  Eastern Missouri



* Effective this Saturday afternoon and evening from 240 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2 inches in diameter possible

  Scattered damaging wind gusts to 70 mph likely

  A tornado or two possible



SUMMARY...Clusters of intense thunderstorms are expected to develop

this afternoon and sag southward across the watch area.  Very moist

and unstable conditions, along with favorable winds aloft, will

promote the risk of a few severe storms capable of damaging winds

and large hail.



The severe thunderstorm watch area is approximately along and 45

statute miles north and south of a line from 45 miles north of

Columbia MO to 40 miles east of Scott Afb IL. 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 285...



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 500. Mean storm motion vector

30025.



...Hart

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