

000 

WWUS20 KWNS 062005

SEL1

SPC WW 062005

IAZ000-MNZ000-NEZ000-SDZ000-070300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 661

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT SUN JUL 6 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST AND NORTH CENTRAL IOWA

       SOUTHERN MINNESOTA

       NORTHEAST NEBRASKA

       FAR SOUTHEAST SOUTH DAKOTA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

1000 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTHWEST

OF NORFOLK NEBRASKA TO 50 MILES EAST SOUTHEAST OF MANKATO

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 660...



DISCUSSION...SUBTLE MID LEVEL IMPULSE WILL CONTINUE TO INCREASE

ASCENT AND THUNDERSTORM COVERAGE ALONG AXIS OF VERY STRONG

INSTABILITY ACROSS WW THIS AFTERNOON.  SHEAR REMAINS MODEST...BUT

STILL SUFFICIENT FOR ORGANIZED CLUSTERS/LINES AND POSSIBLY AN

ISOLATED SUPERCELL AS ACTIVITY SPREADS GENERALLY NEWD THROUGH THE

EVENING.  LARGE HAIL AND DAMAGING WINDS WILL BE PRIMARY SEVERE

THREATS.



AVIATION...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 25020.





...EVANS

