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021 

WWUS20 KWNS 101846

SEL8

SPC WW 101846

IAZ000-MNZ000-110100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 598

NWS STORM PREDICTION CENTER NORMAN OK

150 PM CDT TUE AUG 10 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH  OF WESTERN IOWA

       LARGE PART OF SOUTHERN MINNESOTA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 150 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 1.5 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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF

MINNEAPOLIS MINNESOTA TO 50 MILES EAST SOUTHEAST OF OMAHA

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.



DISCUSSION...LINE OF THUNDERSTORMS W EDGE OF WATCH EXPECTED TO

INTENSIFY AS THEY ENCOUNTER A VERY MOIST/UNSTABLE AIR MASS. WITH

FAVORABLE VEERING SHEAR PROFILES IN LOW LEVELS...SUPERCELLS

INCLUDING TORNADOES ARE POSSIBLE AS OVERALL LINE DEVELOPS/PROPAGATES

NEWD ACROSS THE WATCH



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

600. MEAN STORM MOTION VECTOR 22025.





...HALES

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