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445 

WWUS20 KWNS 310045

SEL5

SPC WW 310045

SDZ000-310500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 425

NWS STORM PREDICTION CENTER NORMAN OK

745 PM CDT SAT JUL 30 2016



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS SATURDAY NIGHT FROM 745 PM UNTIL MIDNIGHT CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER

    POSSIBLE



SUMMARY...A PAIR OF SUPERCELLS THAT DEVELOPED QUICKLY ALONG A

NORTH-NORTHWEST/SOUTH-SOUTHEAST-ORIENTED BOUNDARY OVER NORTHERN

SOUTH DAKOTA SHOULD LAST LONG ENOUGH TO POSE A CONTINUING SEVERE

WIND/HAIL RISK TO NEAR THE PIERRE AREA AND PERHAPS FARTHER SOUTH.

SEE SPC MESOSCALE DISCUSSION 1451 FOR METEOROLOGICAL DETAILS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 35

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST OF

CHAMBERLAIN SOUTH DAKOTA TO 55 MILES NORTH OF PIERRE SOUTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 35030.





...EDWARDS

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