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348 

WWUS20 KWNS 310041

SEL7

SPC WW 310041

ILZ000-310600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 257

NWS STORM PREDICTION CENTER NORMAN OK

735 PM CDT THU MAY 30 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH CENTRAL AND EASTERN ILLINOIS



* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 735 PM

  UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF

CHAMPAIGN ILLINOIS TO 15 MILES WEST OF SALEM ILLINOIS.  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 251...WW 252...WW

253...WW 254...WW 255...WW 256...



DISCUSSION...THUNDERSTORM ACTIVITY NOW NORTH AND EAST OF THE ST.

LOUIS AREA MAY STILL POSE A RISK FOR DAMAGING WIND GUSTS...PERHAPS A

TORNADO...AS IT SPREADS NORTHEASTWARD ACROSS PARTS OF SOUTH

CENTRAL/EASTERN ILLINOIS DURING THE NEXT FEW HOURS.  CONVECTION

GENERALLY COINCIDES WITH A BELT OF 40+ KT LOWER/MID TROPOSPHERIC

FLOW WHICH SUPPORTS THIS THREAT.



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 500. MEAN STORM

MOTION VECTOR 21040.





...KERR

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