

000 

WWUS20 KWNS 242316

SEL4

SPC WW 242316

KSZ000-NEZ000-250500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 74

NWS STORM PREDICTION CENTER NORMAN OK

515 PM MDT SAT MAR 24 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL

1100 PM MDT.



TORNADOES...HAIL TO 1 INCH 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 20 MILES WEST OF IMPERIAL

NEBRASKA TO 45 MILES SOUTH OF BROKEN BOW NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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...CLUSTER OF THUNDERSTORMS HAS DEVELOPED IN LEFT EXIT

REGION OF STRONG UPPER JET...IN REGION OF STRONG AMBIENT VORTICITY.

CLEARING SKIES ARE ALLOWING SOME LATE AFTERNOON

HEATING/DESTABILIZATION AND MAY HELP TO PROMOTE A FEW INTENSE

CONVECTIVE CORES.  LOW-TOPPED SUPERCELLS WILL BE POSSIBLE WITH A

RISK OF HAIL AND ISOLATED TORNADOES.



AVIATION...TORNADOES AND 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 400.

MEAN STORM MOTION VECTOR 23030.





...HART

