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409 

WWUS20 KWNS 182158

SEL7

SPC WW 182158

NDZ000-SDZ000-190500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 527

NWS STORM PREDICTION CENTER NORMAN OK

400 PM MDT WED SEP 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH-CENTRAL NORTH DAKOTA

  NORTHWEST AND NORHT-CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 400 PM

  UNTIL 1100 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 85 MILES SOUTHWEST

OF LEMMON SOUTH DAKOTA TO 75 MILES EAST NORTHEAST OF MOBRIDGE

SOUTH DAKOTA.  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.



&&



DISCUSSION...ONGOING SEVERE THUNDERSTORMS OVER WESTERN SOUTH DAKOTA

ARE EXPECTED TO MERGE INTO A LARGER COMPLEX OF STORMS WHILE MOVING

NORTHEAST INTO NORTH-CENTRAL SOUTH DAKOTA AND SOUTH-CENTRAL NORTH

DAKOTA THIS EVENING INTO TONIGHT.  WHILE SOME HAIL IS

POSSIBLE...DAMAGING WINDS WILL BE THE PRIMARY SEVERE WEATHER HAZARD.



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 24035.





...MEAD

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