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470 

WWUS20 KWNS 181811

SEL3

SPC WW 181811

ILZ000-MOZ000-190200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 493

NWS STORM PREDICTION CENTER NORMAN OK

115 PM CDT TUE AUG 18 2015



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL ILLINOIS

  EASTERN MISSOURI



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 115 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

  A TORNADO OR TWO POSSIBLE



SUMMARY...SCATTERED THUNDERSTORMS EXPECTED DEVELOP/MOVE GENERALLY

NORTHEAST ACROSS WATCH AREA THROUGH EARLY TONIGHT.  THE STORMS

LIKELY WILL MERGE INTO BROKEN LINES...WITH EMBEDDED BOWING SEGMENTS

CAPABLE OF LOCALLY DAMAGING WIND AND...PERHAPS...MARGINALLY SEVERE

HAIL AND/OR A TORNADO OR TWO.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHWEST OF SPRINGFIELD ILLINOIS TO 60 MILES SOUTH SOUTHWEST OF

SAINT LOUIS MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 22030.





...CORFIDI

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