165  
WWUS20 KWNS 211502  
SEL4  
SPC WW 211502  
ARZ000-OKZ000-212000-  
 
URGENT - IMMEDIATE BROADCAST REQUESTED  
SEVERE THUNDERSTORM WATCH NUMBER 154  
NWS STORM PREDICTION CENTER NORMAN OK  
1005 AM CDT FRI APR 21 2017  
 
THE NWS STORM PREDICTION CENTER HAS ISSUED A  
 
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF  
WESTERN ARKANSAS  
EASTERN OKLAHOMA  
 
* EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1005 AM UNTIL  
300 PM CDT.  
 
* PRIMARY THREATS INCLUDE...  
SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS  
TO 75 MPH POSSIBLE  
ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE  
 
SUMMARY...A WELL-ORGANIZED/FAST-MOVING LINE OF THUNDERSTORMS WILL  
CONTINUE MOVING QUICKLY EAST-SOUTHEAST ACROSS CENTRAL AND EASTERN  
OKLAHOMA AND INTO WESTERN ARKANSAS THIS MORNING. THE STORMS WILL BE  
ACCOMPANIED BY A RISK FOR DAMAGING WINDS, ALONG WILL THE POSSIBILITY  
FOR ISOLATED LARGE HAIL.  
 
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55  
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST NORTHWEST  
OF MCALESTER OK TO 75 MILES EAST SOUTHEAST OF FORT SMITH AR. FOR A  
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE  
UPDATE (WOUS64 KWNS WOU4).  
 
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 153...  
 
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO  
2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A  
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR  
29045.  
 
...GOSS  
 
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