840  
WWUS20 KWNS 280327  
SEL0  
SPC WW 280327  
IAZ000-NEZ000-SDZ000-280800-  
 
URGENT - IMMEDIATE BROADCAST REQUESTED  
SEVERE THUNDERSTORM WATCH NUMBER 470  
NWS STORM PREDICTION CENTER NORMAN OK  
1030 PM CDT FRI JUN 27 2025  
 
THE NWS STORM PREDICTION CENTER HAS ISSUED A  
 
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF  
NORTHWEST IOWA  
NORTHEAST NEBRASKA  
SOUTHEAST SOUTH DAKOTA  
 
* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1030 PM  
UNTIL 300 AM CDT.  
 
* PRIMARY THREATS INCLUDE...  
SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80  
MPH POSSIBLE  
ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE  
 
SUMMARY...A WELL-ORGANIZED/INTENSE CLUSTER OF STORMS WITH A HISTORY  
OF SEVERE-CALIBER WINDS WILL CONTINUE SOUTHEASTWARD LATE THIS  
EVENING INTO THE EARLY OVERNIGHT. SEE MESOSCALE DISCUSSION 1483 FOR  
MORE SHORT-TERM DETAILS.  
 
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45  
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH OF  
MITCHELL SD TO 55 MILES EAST NORTHEAST OF SIOUX CITY IA. FOR A  
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE  
UPDATE (WOUS64 KWNS WOU0).  
 
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 467...WW 468...WW 469...  
 
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO  
2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A  
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR  
30030.  
 
...GUYER  
 
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