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WWUS20 KWNS 101757

SEL3

SPC WW 101757

IAZ000-ILZ000-MOZ000-110100-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 203

NWS Storm Prediction Center Norman OK

100 PM CDT Wed May 10 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  southern Iowa

  Northwest Illinois

  Northern Missouri



* Effective this Wednesday afternoon and evening from 100 PM

  until 800 PM CDT.



* Primary threats include...

  Isolated damaging wind gusts to 70 mph possible

  Isolated large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...A warm front will continue to lift slowly northward across

southeast Iowa and north-central IL this afternoon, with a

destabilizing air mass along and south of this front. Strong to

severe thunderstorms across south-central Iowa should continue to

increase in coverage and intensity as they spread east-southeastward

into southeast Iowa, northern Missouri and northwest Illinois

through early evening.



The severe thunderstorm watch area is approximately along and 40

statute miles north and south of a line from 25 miles north of

Lamoni IA to 20 miles east of Peoria IL. For a complete depiction of

the watch see the associated watch outline update (WOUS64 KWNS

WOU3).



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.



&&



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

1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

27035.



...Guyer

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