

692 

WWUS20 KWNS 011855

SEL1

SPC WW 011855

IAZ000-NEZ000-020300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 241

NWS STORM PREDICTION CENTER NORMAN OK

155 PM CDT TUE JUN 1 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF WESTERN IOWA

       LARGE PART OF CENTRAL  AND EASTERN NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 4 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 80 STATUTE

MILES EITHER SIDE OF A LINE FROM 35 MILES EAST SOUTHEAST OF FORT

DODGE IOWA TO 55 MILES SOUTHWEST OF BROKEN BOW NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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 240...



DISCUSSION...ONGOING SEVERE THUNDERSTORMS NRN NEB AND NWRN IA WILL

BECOME MORE WIDESPREAD THRU THE AFTERNOON AS VERY UNSTABLE AIR MASS

FEEDS NWD THRU THE WATCH.  SHEAR PROFILES ALREADY FAVORABLE FOR

SUPERCELLS INCLUDING VERY LARGE HAIL AND TORNADO THREAT.  WITH LOW

LEVEL JET INCREASING TO 35-40KT ERN NEB/WRN IA TOWARD

00Z...POTENTIAL WILL INCREASE FOR TORNADOES INCLUDING POSSIBLY A

STRONG TORNADO IN ADDITION TO VERY LARGE DAMAGING HAIL AS STORMS

CONTINUE TO DEVELOP S AND E ACROSS THE WATCH AREA.



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

SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

600. MEAN STORM MOTION VECTOR 25030.





...HALES

