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013 

WWUS20 KWNS 012246

SEL0

SPC WW 012246

SDZ000-WYZ000-020500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 450

NWS STORM PREDICTION CENTER NORMAN OK

450 PM MDT SUN JUL 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN SOUTH DAKOTA

       NORTHEAST WYOMING



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 450 PM UNTIL

1100 PM MDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF

BUFFALO SOUTH DAKOTA TO 70 MILES SOUTH SOUTHWEST OF RAPID CITY

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 442...WW 443...WW

444...WW 445...WW 446...WW 447...WW 448...WW 449...



DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ALONG AN

NORTH-SOUTH AXIS FROM SOUTHEAST MT INTO EASTERN WY.  THESE STORMS

ARE EXPECTED TO CONTINUE TO INTENSIFY AND SPREAD EASTWARD ACROSS THE

WATCH AREA THIS EVENING.  HOT SURFACE CONDITIONS...MODERATE

CAPE...AND SUFFICIENT WESTERLY FLOW ALOFT WILL PROMOTE A RISK OF

LOCALLY DAMAGING WINDS AND HAIL IN THE STRONGER STORMS.



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 500. MEAN STORM

MOTION VECTOR 27025.





...HART

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