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WWUS20 KWNS 122218

SEL4

SPC WW 122218

ILZ000-MOZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 434

NWS Storm Prediction Center Norman OK

520 PM CDT Thu Aug 12 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  parts of western Illinois

  portions of central and southern Missouri



* Effective this Thursday afternoon and evening from 520 PM until

  1000 PM CDT.



* Primary threats include...

  Isolated damaging wind gusts to 65 mph possible

  Isolated large hail events to 1.5 inches in diameter possible



SUMMARY...A band of thunderstorms will continue shifting

southeastward across Missouri toward the Ozark Plateau, and into

adjacent portions of western Illinois.  Stronger storms within this

band will be capable of producing locally damaging wind gusts, and

hail in excess of 1" in diameter.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 35 miles southwest of

Knob Noster MO to 15 miles north northeast of Scott Afb IL. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU4).



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 431...WW 432...WW 433...



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

1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A

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

28040.



...Goss

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