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WWUS20 KWNS 151935

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SPC WW 151935

COZ000-NEZ000-SDZ000-WYZ000-160300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 395

NWS STORM PREDICTION CENTER NORMAN OK

135 PM MDT FRI JUN 15 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NEBRASKA PANHANDLE

       WESTERN SOUTH DAKOTA

       EASTERN WYOMING



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 900

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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 90 MILES NORTH OF

RAPID CITY SOUTH DAKOTA TO 45 MILES EAST SOUTHEAST OF COLORADO

SPRINGS COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...SCATTERED THUNDERSTORMS ARE FORMING OVER THE HIGHER

TERRAIN OF CENTRAL CO INTO SOUTHERN WY.  OTHER STORMS ARE EXPECTED

TO DEVELOP SOON OVER WESTERN SD.  SUFFICIENT VERTICAL SHEAR IS

PRESENT ACROSS THIS REGION FOR SOME CONVECTIVE ORGANIZATION AND A

RISK OF LOCALLY DAMAGING WINDS AND HAIL IN THE STRONGER STORMS.

EFFECTIVE SHEAR VALUES OVER SD ARE MORE SIGNIFICANT...AND WILL POSE

A GREATER RISK OF SUPERCELLS AND MORE WIDESPREAD HAIL/WIND.



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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