

000 

WWUS20 KWNS 042238

SEL3

SPC WW 042238

IAZ000-NEZ000-050500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 453

NWS STORM PREDICTION CENTER NORMAN OK

540 PM CDT WED JUN 4 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN HALF OF IOWA

       PARTS OF EASTERN NEBRASKA



EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 540 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2 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 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST OF

TEKAMAH NEBRASKA TO 45 MILES SOUTHEAST OF CEDAR RAPIDS IOWA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 447...WW 448...WW

449...WW 450...WW 451...WW 452...



DISCUSSION...THUNDERSTORMS DEVELOPING VICINITY E/W WARM FRONT WHERE

AIR MASS IS VERY WARM AND UNSTABLE.  FAVORABLE VEERING SHEAR

PROFILES AND LOW LCLS SUPPORT TORNADIC SUPERCELLS AS ACTIVITY

DEVELOPS NWD THRU SRN IA/ERN NE.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24025.





...HALES

