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WWUS20 KWNS 302138

SEL9

SPC WW 302138

MIZ000-WIZ000-LMZ000-LSZ000-010400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 249

NWS Storm Prediction Center Norman OK

440 PM CDT Sat Jun 30 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western Upper Michigan

  Northeastern into south central Wisconsin

  Lake Michigan

  Lake Superior



* Effective this Saturday afternoon and evening from 440 PM until

  1100 PM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Bands/clusters of storms are developing from Wisconsin

into western Upper Michigan in a very unstable environment that will

support a mix of organized multicell clusters/bowing segments and

perhaps some embedded supercells.  Damaging winds and large hail

will be the main threats through late evening as the storms spread

east-northeastward.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 10 miles northwest of

Marquette MI to 50 miles south southwest of Lonerock WI. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU9).



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 245...WW 246...WW

247...WW 248...



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 550. Mean storm motion vector

25030.



...Thompson

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