SPC Severe Thunderstorm Watch 641



WW 641 SEVERE TSTM MI LH 102225Z – 110300Z

WW 0641 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 641
NWS Storm Prediction Center Norman OK
625 PM EDT Tue Sep 10 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Central Lower Michigan
  Lake Huron

* Effective this Tuesday evening from 625 PM until 1100 PM EDT.

* Primary threats include...
  Isolated damaging wind gusts to 70 mph possible
  Isolated large hail events to 1 inch in diameter possible
  A tornado or two possible

SUMMARY...Scattered thunderstorms will likely persist through late
evening while spreading eastward across central Lower Michigan.  The
storm environment appears favorable for some supercell structures
capable of producing damaging gusts, marginally severe hail, and
perhaps a tornado or two.

The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 20 miles north of Grand
Rapids MI to 40 miles southeast of Bad Axe MI. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 640...

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
27035.

...Thompson

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