

000 

WWUS20 KWNS 041924

SEL6

SPC WW 041924

NEZ000-SDZ000-050300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 226

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT FRI MAY 4 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTH CENTRAL AND NORTHEAST NEBRASKA

       PARTS OF SOUTHEASTERN SOUTH DAKOTA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH NORTHWEST OF

YANKTON SOUTH DAKOTA TO 45 MILES SOUTH OF BROKEN BOW NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND

INTENSITY VICINITY SURFACE BOUNDARY LOCATED FROM CENTRAL NEB TO ERN

SD.  SHEAR PROFILES WILL STEADILY INCREASE AS PRESSURE FALLS OVER

AREA ENHANCE LOW LEVEL JET. SUPERCELLS WILL BECOME INCREASINGLY

LIKELY THRU THE AFTERNOON WITH ASSOCIATED LARGE HAIL AND TORNADO

POTENTIAL



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 23030.





...HALES

