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154 

WWUS20 KWNS 201944

SEL2

SPC WW 201944

ILZ000-LMZ000-210200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 532

NWS Storm Prediction Center Norman OK

245 PM CDT Sat Jul 20 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Illinois

  Lake Michigan



* Effective this Saturday afternoon and evening from 245 PM until

  900 PM CDT.



* Primary threats include...

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Bands of strong-to-severe thunderstorms across far

southern Wisconsin may develop east-southeastward into northern

Illinois near a southward-sagging outflow boundary. The air mass

across northern Illinois is very hot and unstable. Thus, any storm

development into/across northern Illinois could pose a damaging wind

risk through the afternoon/early evening.



The severe thunderstorm watch area is approximately along and 25

statute miles north and south of a line from 65 miles west of

Rockford IL to 100 miles east of Rockford IL. 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 529...WW 530...WW 531...



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 600. Mean storm motion vector

29025.



...Guyer

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