420  
WWUS20 KWNS 122022  
SEL3  
SPC WW 122022  
NEZ000-SDZ000-130300-  
 
URGENT - IMMEDIATE BROADCAST REQUESTED  
SEVERE THUNDERSTORM WATCH NUMBER 273  
NWS STORM PREDICTION CENTER NORMAN OK  
325 PM CDT THU JUL 12 2018  
 
THE NWS STORM PREDICTION CENTER HAS ISSUED A  
 
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF  
NORTH CENTRAL AND NORTHEASTERN NEBRASKA  
SOUTH CENTRAL AND SOUTHEASTERN SOUTH DAKOTA  
 
* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 325 PM UNTIL  
1000 PM CDT.  
 
* PRIMARY THREATS INCLUDE...  
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE  
ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE  
 
SUMMARY...THUNDERSTORMS SHOULD INCREASE IN COVERAGE/INTENSITY ALONG  
A SLOW-MOVING FRONT FROM NORTH CENTRAL NEBRASKA INTO SOUTHEASTERN  
SOUTH DAKOTA THIS AFTERNOON INTO THIS EVENING. THE MAIN THREAT WILL  
BE DAMAGING WINDS WITH MULTICELL STORM CLUSTERS DEVELOPING TOWARD  
THE EAST-NORTHEAST.  
 
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55  
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF MULLEN  
NE TO 10 MILES EAST OF SIOUX FALLS SD. FOR A COMPLETE DEPICTION OF  
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS  
WOU3).  
 
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.  
 

 
 
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO  
1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW  
CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR  
24020.  
 
...THOMPSON  
 
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