

000 

WWUS20 KWNS 082144

SEL2

SPC WW 082144

IAZ000-KSZ000-MOZ000-NEZ000-090500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 572

NWS STORM PREDICTION CENTER NORMAN OK

445 PM CDT WED AUG 8 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN IOWA

       NORTHEAST KANSAS

       NORTHERN MISSOURI

       SOUTHEAST NEBRASKA



EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 445 PM UNTIL MIDNIGHT 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 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTHWEST OF

BEATRICE NEBRASKA TO 25 MILES NORTHEAST OF KIRKSVILLE MISSOURI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 568...WW 569...WW

570...WW 571...



DISCUSSION...SUPERCELL THUNDERSTORMS ARE EXPECTED TO RAPIDLY DEVELOP

IN THE NEXT 1-2 HOURS OVER SOUTHEAST NEB AND NORTHEAST KS...WHERE

EXTREMELY UNSTABLE AIR MASS AND FAVORABLE VERTICAL SHEAR PROFILES

ARE PRESENT.  THESE STORMS ARE LIKELY TO TRACK EASTWARD ALONG

SURFACE BOUNDARY ACROSS NORTHERN MO AND EXTREME SOUTHERN IA DURING

THE EVENING.  DAMAGING WINDS AND LARGE HAIL ARE THE MAIN THREATS.

HOWEVER...DEGREE OF INSTABILITY...SURFACE DEWPOINTS IN THE MID/UPPER

70S...AND SUFFICIENT LOW LEVEL SHEAR INDICATE A RISK OF ISOLATED

TORNADOES.



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

600. MEAN STORM MOTION VECTOR 27030.





...HART

