

637 

WWUS20 KWNS 181803

SEL8

SPC WW 181803

ILZ000-INZ000-MOZ000-190000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 598

NWS Storm Prediction Center Norman OK

105 PM CDT Sun Aug 18 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern Illinois

  Central and southwest Indiana

  Southeast Missouri



* Effective this Sunday afternoon and evening from 105 PM until

  700 PM CDT.



* 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 increase in coverage and

intensity this afternoon from southeast Missouri into central

Indiana, along a remnant outflow boundary.  The storm environment

across this corridor will favor multicell clusters capable of

producing damaging winds and large hail through the afternoon.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 45 miles southwest of

Farmington MO to 55 miles northeast of Indianapolis IN. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU8).



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 550. Mean storm motion vector

27025.



...Thompson

