

032 

WWUS20 KWNS 202149

SEL2

SPC WW 202149

ILZ000-INZ000-210300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 12

NWS STORM PREDICTION CENTER NORMAN OK

350 PM CST THU FEB 20 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EAST CENTRAL ILLINOIS

  WEST CENTRAL INDIANA



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 350 PM UNTIL

  900 PM CST.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES EAST

NORTHEAST OF CHAMPAIGN ILLINOIS TO 70 MILES SOUTH SOUTHWEST OF

TERRE HAUTE INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 9...WW 10...WW 11...



DISCUSSION...A BROKEN BAND OF STRONG/SEVERE STORMS WILL CONTINUE EWD

ALONG THE SURGING COLD FRONT FROM IL INTO INDIANA LATER THIS

EVENING.  THE STORMS ARE IN THE MOST FAVORABLE SUPERCELL ENVIRONMENT

NOW...WITH GRADUALLY COOLING SURFACE TEMPERATURES WITH EWD EXTENT IN

THE WARM SECTOR.  ALSO...THE WARM SECTOR WILL MOVE ONLY A LITTLE

FARTHER N...WHICH SUGGESTS THAT A FEW DAMAGING GUSTS AND MARGINALLY

SEVERE HAIL WILL BE THE MAIN THREATS.  AN ISOLATED TORNADO CANNOT BE

RULED OUT WITH STORMS INTERACTING WITH THE WARM FRONT...BUT THE

OVERALL RISK APPEARS RATHER MARGINAL.



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 450. MEAN STORM MOTION

VECTOR 24055.





...THOMPSON

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