

603 

WWUS20 KWNS 141747

SEL9

SPC WW 141747

ILZ000-INZ000-OHZ000-150100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 879

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT MON NOV 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EAST-CENTRAL AND SOUTHERN ILLINOIS

       INDIANA

       WESTERN OHIO



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 145 PM UNTIL 900

PM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF

DECATUR ILLINOIS TO 70 MILES EAST OF FORT WAYNE INDIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...INCIPIENT SURFACE-BASED TSTMS ARE EXPECTED TO DEVELOP

INVOF MIGRATORY SURFACE LOW AND ASSOCIATED WARM FRONT WHERE PRESSURE

FALLS ARE FOCUSING LOW-LEVEL CONVERGENCE.  HERE...AREA VAD AND RUC

OBJECTIVE DATA INDICATE VERY STRONG LOW- AND DEEP-LAYER SHEAR WHICH

WILL SUPPORT SUPERCELLS AND BOWING STRUCTURES CAPABLE OF A FEW

TORNADOES AND DAMAGING WINDS.  GIVEN THE MAGNITUDE OF THE LOW-LEVEL

SHEAR AND ANTICIPATED FAST STORM MOTIONS...A TORNADO OR TWO COULD BE

STRONG AND POTENTIALLY LONG-TRACKED.

EXPECT ADDITIONAL STORMS TO FORM ALONG THE TRAILING COLD FRONT

ADVANCING THROUGH SRN IL WITH AN ATTENDANT RISK FOR DAMAGING WINDS

AND PERHAPS A TORNADO OR TWO.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.

MEAN STORM MOTION VECTOR 26050.





...MEAD

