

833 

WWUS20 KWNS 261836

SEL5

SPC WW 261836

IAZ000-ILZ000-INZ000-WIZ000-LMZ000-270200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 305

NWS Storm Prediction Center Norman OK

135 PM CDT Fri Jun 26 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeastern and east central Iowa

  Northern Illinois

  Extreme northwestern Indiana

  Southern Wisconsin

  Lake Michigan



* Effective this Friday afternoon and evening from 135 PM until

  900 PM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  Scattered large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...Thunderstorms are expected to increase in coverage and

intensity this afternoon, beginning in northeastern Iowa and

spreading eastward.  Initial storm development will be more discrete

cells, with some potential for an isolated supercell or two, though

some upscale growth into a larger cluster is expected later this

afternoon.  Damaging winds will be the main threat, though isolated

large hail will be possible with the more cellular storms early, and

an isolated tornado or two cannot be ruled out, especially with

embedded circulations in any north-south oriented line segments.



The severe thunderstorm watch area is approximately along and 70

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

Rapids IA to 45 miles southeast of Racine WI. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU5).



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 550. Mean storm motion vector

28040.



...Thompson

