

000 

WWUS20 KWNS 292347

SEL8

SPC WW 292347

IAZ000-KSZ000-NEZ000-300700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 388

NWS STORM PREDICTION CENTER NORMAN OK

645 PM CDT THU MAY 29 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WEST CENTRAL AND SOUTHWEST IOWA

       NORTHEAST KANSAS

       EAST CENTRAL AND SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 645 PM

UNTIL 200 AM CDT.



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

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF

TEKAMAH NEBRASKA TO 70 MILES SOUTH OF BEATRICE NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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 384...WW 385...WW

386...WW 387...



DISCUSSION...SUPERCELL CLUSTERS OVER S CENTRAL NEB AND N CENTRAL KS

WILL SPREAD EWD THROUGH THE EVENING TOWARD NE KS/SE NEB/SW IA.

RECENT OBSERVATIONAL TRENDS AND SHORT TERM MODEL FORECASTS SUPPORT A

TENDENCY FOR UPSCALE GROWTH OF THE CONVECTION INTO A COUPLE OF MCS/S

...WITH AN INCREASING THREAT FOR DAMAGING WINDS THEREAFTER.  UNTIL

THEN...THE THREAT FOR TORNADOES /POSSIBLY AN ISOLATED STRONG TORNADO

/ AND LARGE HAIL WILL CONTINUE WITH SUPERCELLS...GIVEN A RELATIVELY

MOIST BOUNDARY LAYER AND INCREASING LOW-LEVEL SHEAR THROUGH 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 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 26035.





...THOMPSON

