318  
WWUS20 KWNS 121843  
SEL7  
SPC WW 121843  
NJZ000-NYZ000-PAZ000-130100-  
 
URGENT - IMMEDIATE BROADCAST REQUESTED  
SEVERE THUNDERSTORM WATCH NUMBER 447  
NWS STORM PREDICTION CENTER NORMAN OK  
245 PM EDT SAT AUG 12 2017  
 
THE NWS STORM PREDICTION CENTER HAS ISSUED A  
 
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF  
WESTERN NEW JERSEY  
CENTRAL AND EASTERN NEW YORK  
CENTRAL AND EASTERN PENNSYLVANIA  
 
* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 245 PM UNTIL  
900 PM EDT.  
 
* PRIMARY THREATS INCLUDE...  
SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE  
ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE  
 
SUMMARY...STORMS WILL CONTINUE TO INCREASE AND INTENSIFY THIS  
AFTERNOON, PERHAPS ESPECIALLY ACROSS SOUTH-CENTRAL/SOUTHEAST  
PENNSYLVANIA AS WELL AS EAST-CENTRAL NEW YORK. SEVERE HAIL AND WIND  
WILL BE POSSIBLE WITH THE STRONGEST STORMS AS THEY SPREAD EASTWARD  
THROUGH THE AFTERNOON AND EARLY EVENING.  
 
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60  
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF  
UTICA NY TO 35 MILES SOUTH OF HARRISBURG PA. 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.  
 

 
 
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO  
1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A  
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR  
27025.  
 
...GUYER  
 
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