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WWUS20 KWNS 090431

SEL8

SPC WW 090431

NDZ000-SDZ000-091100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 518

NWS STORM PREDICTION CENTER NORMAN OK

1130 PM CDT SUN SEP 8 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHERN NORTH DAKOTA

  CENTRAL AND NORTHERN SOUTH DAKOTA



* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1130 PM

  UNTIL 600 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTHEAST OF

PIERRE SOUTH DAKOTA TO 70 MILES NORTH OF MOBRIDGE SOUTH DAKOTA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 517...



DISCUSSION...BKN BAND OF TSTMS THAT HAS INTERMITTENTLY EXCEEDED

SVR-WIND LIMITS IS EXPECTED TO MOVE INTO WW AREA WITHIN 1-2 HOURS.

MOST INTENSE PORTION CURRENTLY MANIFEST AS BOW ECHO OVER PORTIONS

MEADE/ZIEBACH/PERKINS COUNTIES HAS INCREASINGLY WELL-DEVELOPED

REAR-INFLOW JET AND WILL MOVE INTO MOIST/NEARLY SFC-BASED

EFFECTIVE-INFLOW PARCELS.  CURRENTLY NON-SVR ACTIVITY FARTHER N AND

ESPECIALLY S ALSO MAY REACH SVR LEVELS AS IT MOVES NEWD...AMIDST

FAVORABLE LOW-LEVEL WAA.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 23035.





...EDWARDS

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