

217 

WWUS20 KWNS 050816

SEL7

SPC WW 050816

SDZ000-051500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 467

NWS STORM PREDICTION CENTER NORMAN OK

215 AM MDT MON AUG 5 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHWEST AND SOUTH CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS MONDAY MORNING FROM 215 AM UNTIL 900 AM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST

SOUTHWEST OF RAPID CITY SOUTH DAKOTA TO 55 MILES SOUTHEAST OF

PIERRE 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...SLIGHTLY ELEVATED...LONG-LIVED TSTMS NOW NE WY AND SW

SD EXPECTED TO CONTINUE MAINLY E INTO INCREASINGLY MOIST ENVIRONMENT

ALONG AND E OF SFC TROUGH OVER THE SD BADLANDS. AMPLE /30+ KT/

UNIDIRECTIONAL CLOUD-LAYER SHEAR ON RAPID CITY VWP SUGGESTS

POTENTIAL FOR CONTINUED STORM SUSTENANCE...AND DMGG SFC WIND/SVR

HAIL...DESPITE WEAK LOW-LVL FLOW.



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 29030.





...CORFIDI

