SPC Severe Thunderstorm Watch 645



WW 645 SEVERE TSTM MI WI LE LH LM 111830Z – 120300Z

WW 0645 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 645
NWS Storm Prediction Center Norman OK
230 PM EDT Wed Sep 11 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Central and Southern Lower Michigan
  Southern Wisconsin
  Lake Erie
  Lake Huron
  Lake Michigan

* Effective this Wednesday afternoon and evening from 230 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...Thunderstorms are expected to intensify across southern
Wisconsin and the southern half of Lower Michigan this afternoon,
with multiple rounds of strong to severe storms.  Damaging winds
will be the main threat in the most intense cells.

The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 25 miles east of Mount
Clemens MI to 10 miles north of Lonerock WI. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).

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 500. Mean storm motion vector
28025.

...Hart

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