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000 

WWUS20 KWNS 161913

SEL4

SPC WW 161913

IAZ000-MNZ000-SDZ000-170400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 524

NWS STORM PREDICTION CENTER NORMAN OK

210 PM CDT MON JUL 16 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL IOWA

       SOUTHERN AND WESTERN MINNESOTA

       EASTERN SOUTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 3 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 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH NORTHEAST OF

WATERTOWN SOUTH DAKOTA TO 45 MILES WEST SOUTHWEST OF WATERLOO

IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 523...



DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO DEVELOP IN ERN SD AND

MOVE/SPREAD GENERALLY SE INTO PARTS OF MN AND IA THROUGH MID EVENING

AS STRONG HEATING CONTINUES ALONG NW-SE ORIENTED SFC FRONT

DOWNSTREAM FROM UPR IMPULSE CROSSING THE CNTRL DAKOTAS.  FAIRLY

MOIST WSWLY LOW LVL INFLOW AND STEEP LOW TO MID LVL LAPSE RATES

EXPECTED IN WW AREA SUGGEST GOOD LIKELIHOOD FOR LARGE/SUSTAINED

STORMS/SUPERCELLS WITH LARGE HAIL/DAMAGING WINDS.  A COUPLE

TORNADOES MAY ALSO OCCUR...MAINLY DURING EARLY STAGES OF STORM

DEVELOPMENT AND/OR IN IMMEDIATE VICINITY SFC BOUNDARY IN MN/IA.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 32030.





...CORFIDI

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