High Wind Warning 6, NWS Rapid City, SD

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
210 AM MDT SUN SEP 27 2009

.DISCUSSION...AT 08Z SFC MAP SHOWS CDFNT NOW MVG THRU MONTANA
AND SHOULD PUSH INTO NWRN SD IN NEXT FEW HOURS. ALOFT...NW
FLOW CONTS ACRS THE REGION WITH S/W MVG INTO NERN MONTANA.
SKIES ARE CLEAR ACRS THE REGION WITH TEMPS IN THE 50S TO ARD
60.

TODAY...CDFNT WILL PUSH ACRS REGION. STG CAA WILL COMBINE WITH
4-6MB/3HR PRESSURE RISES BEHIND FRONT AND 850MB WINDS INCREASING
TO 35-40 KTS WILL PRODUCE STG NW WINDS ACRS WRN SD PLAINS. WILL
GO WITH HWW ON PLAINS MAINLY FROM I-90 NORTH FOR WINDS 35-45 KTS
WITH GUSTS TO 60 MPH. WILL CONTINUE WIND ADVISORY ACRS SRN AND
SOUTH CENTRAL SD FOR WINDS OF 25-40 MPH WINDS WITH GUSTS TO 50
MPH. AIRMASS IS QUITE DRY SO EXPECT NO PCPN WITH FRONT.

TONIGHT...WINDS WILL DIMINISH QUICKLY THIS EVENING WITH CLEAR
SKIES AND COOL TEMPS. MOST AREAS WILL DROP INTO 30S...THOUGH
SOME 20S LIKELY IN HIGHER ELEVATIONS OF BLK HLS.

MONDAY...UPPER RIDGE WILL QUICKLY BUILD BACK INTO THE NRN PLAINS
WITH RETURN FLOW DEVELOPING ACROSS AREA. THERE WILL BE PLENTY OF
SUNSHINE WITH HIGHS IN MID 60S TO LOWER 70S.

MONDAY NITE...SKIES WILL BE MOSTLY CLEAR WITH SEASONAL TEMPS.

TUESDAY...SE RETURN FLOW WILL INCREASE WITH TEMPS INCREASING INTO
70S OVER ALL AREAS EXCEPT BLK HILLS WHERE HIGHS WILL BE AGAIN IN
60S. ANOTHER NICE DAY WITH PLENTY OF SUNSHINE.

TUESDAY NIGHT...UPPER RIDGE BEGINS TO MORE EAST AS UPPER FLOW
TURNS SW. SE WINDS WILL BEGIN TO TURN S-SW ACRS NERN WY AND FAR
WRN SD.

EXTENDED...DEEP UPPER LEVEL TROF WILL SLOWLY APPROACH THE AREA ON
WEDNESDAY INTO WEDNESDAY NIGHT. THIS WILL BRING A CHANCE FOR
PRECIPITATION...PARTICULARLY IN THE EVENING AS A COLD FRONT SLIDES
THROUGH. TEMPERATURES PROFILES WILL BE COLD ENOUGH TO POSSIBLY
RESULT IN SOME SNOW OVER THE BLACK HILLS AND NORTHEAST WYO. GUSTY
NORTHWEST WINDS INCREASE ON THURSDAY BRINGING COOLER TEMPERATURES
IN THE WAKE OF THE FRONT WITH CHANCES FOR PRECIPITATION CONTINUING
AS THE TROF CONTINUES ITS APPROACH. PRECIP WILL TAPER OFF FROM WEST
TO EAST THURSDAY NIGHT AND END BY FRIDAY AS THE TROF SLIDES TO THE
EAST.

&&

.AVIATION...GUSTY NORTHWEST WINDS ARE EXPECTED ACRS THE AREA TODAY
IN THE WAKE OF A PASSING COLD FRONT. THE STRONGEST WINDS WILL BE
OVER THE PLAINS OF NORTHWEST AND WEST CENTRAL SOUTH DAKOTA...WHERE
GUSTS OVER 50 KTS WILL BE POSSIBLE. THE WINDS WILL START TAPERING
OFF LATE THIS AFTERNOON.  OTHERWISE...VFR CONDITIONS ARE EXPECTED.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...WIND ADVISORY FROM 11 AM MDT /NOON CDT/ TO 6 PM MDT /7 PM
     CDT/SUNDAY FOR BENNETT-JACKSON-MELLETTE-SHANNON-TODD-TRIPP.

     HIGH WIND WARNING FROM 6 AM TO 6 PM MDT SUNDAY FOR BUTTE-
     HARDING-PERKINS.

     HIGH WIND WARNING FROM 8 AM TO 6 PM MDT SUNDAY FOR CUSTER CO
     PLAINS-HAAKON-HERMOSA FOOT HILLS-NORTHERN FOOTHILLS-NORTHERN
     MEADE CO PLAINS-PENNINGTON CO PLAINS-RAPID CITY-SOUTHERN
     MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-ZIEBACH.

WY...NONE.

&&

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