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WWUS20 KWNS 172213

SEL0

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ILZ000-MOZ000-180200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 520

NWS Storm Prediction Center Norman OK

515 PM CDT Wed Jul 17 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern Illinois

  Extreme east central and southeastern Missouri



* Effective this Wednesday afternoon and evening from 515 PM

  until 900 PM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1 inch in diameter possible



SUMMARY...A long-lived convective complex with a history of damaging

gusts will likely persist for the next few hours while continuing

south-southeastward near the Mississippi River into southern

Illinois.  The downstream environment will continue to favor

damaging winds, especially with cell mergers.



The severe thunderstorm watch area is approximately along and 65

statute miles east and west of a line from 5 miles north northwest

of Alton IL to 20 miles southeast of Carbondale IL. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU0).



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 516...WW 517...WW

518...WW 519...



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 650. Mean storm motion vector

33035.



...Thompson

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