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608 

WWUS20 KWNS 181104

SEL7

SPC WW 181104

IAZ000-ILZ000-INZ000-MIZ000-WIZ000-LMZ000-181800-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 597

NWS Storm Prediction Center Norman OK

605 AM CDT Sun Aug 18 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Extreme eastern Iowa

  Northern Illinois

  Northern Indiana

  Southwestern and south-central Lower Michigan

  Southern Wisconsin

  Lake Michigan



* Effective this Sunday morning and afternoon from 605 AM until

  100 PM CDT.



* Primary threats include...

  Scattered damaging winds likely with isolated significant gusts

    to 75 mph possible

  Isolated large hail events to 1 inch in diameter possible

  A tornado or two possible



SUMMARY...An increasingly organized band of thunderstorms should

continue to strengthen through the remainder of the morning as it

encounters a favorably moist and destabilizing air mass across the

watch area.  As this occurs, the threat for damaging wind should

become more dense and intense, and isolated risk for a QLCS tornado

may appear as well.  See SPC mesoscale discussion 1785 for initial

meteorological reasoning.



The severe thunderstorm watch area is approximately along and 135

statute miles east and west of a line from 45 miles southeast of

Marseilles IL to 40 miles east northeast of Milwaukee WI. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU7).



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 596...



AVIATION...A few severe thunderstorms with hail surface and aloft to

1 inch. Extreme turbulence and surface wind gusts to 65 knots. A few

cumulonimbi with maximum tops to 550. Mean storm motion vector

27040.



...Edwards

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