

485 

WWUS20 KWNS 241913

SEL0

SPC WW 241913

MIZ000-LHZ000-250200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 390

NWS Storm Prediction Center Norman OK

315 PM EDT Sat Jul 24 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central and Southern Lower Michigan

  Lake Huron



* Effective this Saturday afternoon and evening from 315 PM until

  1000 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1 inch in diameter possible

  A tornado or two possible



SUMMARY...Multiple lines and clusters of thunderstorms will move

across the watch area this afternoon and early evening, posing a

risk of locally damaging wind gusts and isolated hail.  A tornado or

two cannot be ruled out.



The severe thunderstorm watch area is approximately along and 65

statute miles north and south of a line from 40 miles east of Oscoda

MI to 35 miles west of Grand Rapids 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.



&&



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 500. Mean storm motion vector

28030.



...Hart

