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WWUS20 KWNS 071919

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 490

NWS Storm Prediction Center Norman OK

320 PM EDT Tue Sep 7 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Indiana

  Southern Lower Michigan

  Lake Erie

  Lake Huron

  Lake Michigan



* Effective this Tuesday afternoon and evening from 320 PM until

  1100 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  A tornado or two possible



SUMMARY...Thunderstorms will increase in coverage and intensity this

afternoon as they spread eastward across the watch area.  Damaging

winds and hail are the main threats, although there is some risk of

a tornado or two as winds aloft strengthen this evening.



The severe thunderstorm watch area is approximately along and 60

statute miles north and south of a line from 35 miles west southwest

of Benton Harbor MI to 40 miles north northeast of Mount Clemens MI.

For a complete depiction of the watch see the associated watch

outline update (WOUS64 KWNS WOU0).



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 488...WW 489...



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 500. Mean storm motion vector

27035.



...Hart

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