

065 

WWUS20 KWNS 122120

SEL4

SPC WW 122120

MIZ000-LHZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 494

NWS Storm Prediction Center Norman OK

525 PM EDT Sun Sep 12 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southeast Lower Michigan

  Lake Huron



* Effective this Sunday afternoon and evening from 525 PM until

  1100 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1.5 inches in diameter possible



SUMMARY...An isolated supercell on the cool side of a surface front

will pose a threat for isolated large hail and damaging winds, while

other storms farther west could move into southeast Lower Michigan

later this evening.



The severe thunderstorm watch area is approximately along and 35

statute miles north and south of a line from 30 miles west of Flint

MI to 30 miles north northeast of Mount Clemens MI. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU4).



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 493...



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 500. Mean storm motion vector

28040.



...Thompson

