SPC Severe Thunderstorm Watch 651



WW 651 SEVERE TSTM IL WI LM 122335Z – 130700Z

WW 0651 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 651
NWS Storm Prediction Center Norman OK
635 PM CDT Thu Sep 12 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  northern Illinois
  southern Wisconsin
  Lake Michigan

* Effective this Thursday night and Friday morning from 635 PM
  until 200 AM CDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph possible
  Scattered large hail events to 1.5 inches in diameter possible
  A tornado or two possible

SUMMARY...Thunderstorms ongoing near and west of the Mississippi
River are expected to increase in coverage, while spreading eastward
across southern Wisconsin and northern Illinois over the next
several hours.  Damaging winds will be the primary severe threat
accompanying the stronger storms, though hail will also be possible
locally.  In addition, a tornado or two may also occur --
particularly within a few counties either side of the
Wisconsin/Illinois border area.

The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 35 miles north northeast
of Madison WI to 60 miles southwest of Marseilles IL. 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 648...WW 649...WW 650...

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 550. Mean storm motion vector
23030.

...Goss

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