676
WWUS20 KWNS 182346
SEL7
SPC WW 182346
IAZ000-MNZ000-190500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 597
NWS STORM PREDICTION CENTER NORMAN OK
650 PM CDT TUE AUG 18 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN IOWA
FAR SOUTHWEST MINNESOTA
* EFFECTIVE THIS TUESDAY NIGHT FROM 650 PM UNTIL MIDNIGHT CDT.
* PRIMARY THREATS INCLUDE...
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SUMMARY...SUPERCELLS SHOULD FURTHER DEVELOP AND TRACK SOUTHEASTWARD
THIS EVENING FROM FAR SOUTHWEST MINNESOTA INTO PARTS OF NORTHERN
IOWA ALONG AND AHEAD OF A COLD FRONT. LARGE HAIL UP TO 2 INCHES IN
DIAMETER SHOULD BE THE MAIN THREAT WITH THIS ACTIVITY, BUT
OCCASIONAL SEVERE/DAMAGING WINDS MAY ALSO OCCUR.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST OF
WORTHINGTON MN TO 15 MILES EAST NORTHEAST OF WATERLOO IA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 595...WW 596...
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
31025.
...GLEASON
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