

674 

WWUS20 KWNS 142056

SEL5

SPC WW 142056

IAZ000-MOZ000-150400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 475

NWS STORM PREDICTION CENTER NORMAN OK

355 PM CDT TUE JUN 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST AND SOUTH CENTRAL IOWA

       MUCH OF NORTHERN AND CENTRAL MISSOURI



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 355 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 3 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF LAMONI IOWA

TO 50 MILES SOUTHWEST OF JEFFERSON CITY MISSOURI.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU5).



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...CONVECTIVE INHIBITION IS WEAKENING E OF THE SURFACE LOW

NEAR THE MO RIVER...AND MLCAPE HAS INCREASED TO AOA 3000 J/KG.  THE

CAP WILL CONTINUE TO WEAKEN WITH ADDITIONAL HEATING AND AN INCREASE

IN ASCENT FROM THE W AS A COLD FRONT AND ASSOCIATED MIDLEVEL TROUGH

PROGRESS EWD FROM KS TO MO.  THE ENVIRONMENT APPEARS FAVORABLE FOR

SUPERCELLS WITH VERY LARGE HAIL AND A FEW TORNADOES THIS

EVENING...ESPECIALLY WITH THE INITIALLY MORE DISCRETE DEVELOPMENT IN

THE AREA OF ENHANCED LOW-LEVEL SHEAR ACROSS N/NW MO.  LATER THIS

EVENING INTO EARLY TONIGHT...CONVECTION WILL LIKELY GROW UPSCALE

INTO AN MCS WITH EMBEDDED SUPERCELLS/BOWS AND A CONTINUED RISK FOR

LARGE HAIL AND DAMAGING WINDS.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 30025.





...THOMPSON

