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WWUS20 KWNS 141906

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 498

NWS Storm Prediction Center Norman OK

305 PM EDT Tue Sep 14 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Indiana

  Southern and eastern Lower Michigan

  Extreme northwestern Ohio

  Lake Erie

  Lake Huron

  Lake Michigan



* Effective this Tuesday afternoon and evening from 305 PM until

  1100 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  Isolated large hail events to 1.5 inches in diameter possible



SUMMARY...Thunderstorm development is underway, and additional

storms will form and intensify this afternoon in multiple bands

along and ahead of a surface cold front.  The storm environment

favors a mix of storm clusters (with some supercell structures

possible) and line segments, with damaging winds to 70 mph and

isolated large hail of 1 to 1.5 inch diameter possible through late

evening.



The severe thunderstorm watch area is approximately along and 70

statute miles east and west of a line from 55 miles north northeast

of Bad Axe MI to 40 miles west southwest of Fort Wayne IN. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU8).



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

26040.



...Thompson

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