

399 

WWUS20 KWNS 131942

SEL3

SPC WW 131942

IAZ000-ILZ000-MOZ000-140300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 293

NWS STORM PREDICTION CENTER NORMAN OK

240 PM CDT WED MAY 13 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN IOWA

       PARTS OF WESTERN ILLINOIS

       PARTS OF NORTHERN MISSOURI



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF

LAMONI IOWA TO 70 MILES EAST SOUTHEAST OF BURLINGTON IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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...WITH STRONG TROUGH/WIND MAX PASSING BY TO THE NORTH AND

AIR MASS ACROSS WATCH AREA BECOMING MODERATELY UNSTABLE AND ONLY

WEAKLY CAPPED...THUNDERSTORMS SHOULD INITIATE SOON.  PRIMARY FOCUS

WILL BE ALONG AND AHEAD OF THE COLD FRONT NOW INTO SWRN IA TO NERN

KS AND EWD ALONG WARM FRONT VICINITY IA/MO BORDER.  STRONG VEERING

SHEAR PROFILES SUPPORT SUPERCELLS WHICH WILL INCLUDE NOT ONLY LARGE

HAIL AND WIND THREAT BUT ALSO TORNADOES.  STORMS SHOULD MOVE/DEVELOP

EWD/SEWD ACROSS THE WATCH AS COLD FRONT MOVES SEWD THRU THE EVENING.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 26040.





...HALES

