

000 

WWUS20 KWNS 081821

SEL8

SPC WW 081821

IAZ000-090100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 488

NWS STORM PREDICTION CENTER NORMAN OK

125 PM CDT SUN JUN 8 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN IOWA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 125 PM UNTIL 800

PM 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 EAST AND WEST OF A LINE FROM 30 MILES WEST OF LAMONI IOWA

TO 50 MILES NORTH NORTHEAST OF DES MOINES IOWA.  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 485...WW 486...WW 487...



DISCUSSION...THUNDERSTORMS HAVE BEGUN TO FORM ALONG SURFACE FRONT

OVER SOUTHWEST IA.  THESE STORMS ARE IN REGION OF VERY MOIST AND

MODERATELY UNSTABLE AIRMASS.  ACTIVITY WILL LIKELY TRACK

EAST-NORTHEASTWARD AND INTERACT WITH REMNANT OUTFLOW BOUNDARY FOR

MORNING CONVECTION.  SUPERCELLS CAPABLE OF DAMAGING WINDS...ISOLATED

TORNADOES...AND HAIL ARE POSSIBLE.



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 24035.





...HART

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