

753 

WWUS20 KWNS 040026

SEL6

SPC WW 040026

NDZ000-SDZ000-WYZ000-040800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 466

NWS STORM PREDICTION CENTER NORMAN OK

625 PM MDT SAT AUG 3 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHWEST NORTH DAKOTA

  WESTERN SOUTH DAKOTA

  NORTHEAST WYOMING



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 625 PM

  UNTIL 200 AM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 110

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH

NORTHWEST OF GILLETTE WYOMING TO 60 MILES EAST OF BUFFALO SOUTH

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 463...WW 464...WW 465...



DISCUSSION...WITHIN AN ENVIRONMENT CHARACTERIZED BY MODERATE

INSTABILITY/RELATIVELY STRONG VERTICAL SHEAR...WIDELY SCATTERED

TSTMS WILL CONTINUE TO SPREAD GENERALLY EASTWARD ACROSS NORTHEAST WY

INTO WESTERN SD...WITH A FEW SUPERCELLS/MORE LIKELY MCS DEVELOPMENT

EXPECTED TO OCCUR FROM EASTERN MT INTO PARTS OF THE WESTERN DAKOTAS

INTO THE OVERNIGHT. DAMAGING WINDS AND SEVERE HAIL ARE THE PRIMARY

HAZARDS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 27035.





...GUYER

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