

436 

WWUS20 KWNS 201841

SEL4

SPC WW 201841

ILZ000-INZ000-KYZ000-MOZ000-210100-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 604

NWS Storm Prediction Center Norman OK

145 PM CDT Tue Aug 20 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern Illinois

  Southern Indiana

  Western and northern Kentucky

  Southeastern Missouri



* Effective this Tuesday afternoon and evening from 145 PM until

  800 PM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1 inch in diameter possible



SUMMARY...Thunderstorms will continue to develop along an outflow

boundary that will progress southeastward through the afternoon.

The storm environment ahead of the boundary favors multicell

clusters capable of producing damaging winds with downbursts through

the remainder of the afternoon.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 25 miles north

northwest of Poplar Bluff MO to 30 miles northeast of Louisville KY.

For a complete depiction of the watch see the associated watch

outline update (WOUS64 KWNS WOU4).



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 602...WW 603...



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 550. Mean storm motion vector

30020.



...Thompson

