FXUS65 KBOU 111032
AFDBOU
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
330 AM MST FRI DEC 11 2009
.SHORT TERM...UNDER THE INFLUENCE OF SHORT WAVE RIDGE...COLORADO
WILL BE UNDER A MODERATE WLY FLOW ALOFT. SPATIAL CROSS-SECTIONS DO
NOT SHOW MUCH IN THE WAY OF AMPLIFIED MOUNTAIN WAVE DEVELOPMENT
TODAY. WINDS IN THE MTNS AND FOOTHILLS WILL BE IN THE BREEZY TO
WINDY RANGE...BUT NOTHING SIGNIFICANT. COLD AMS WILL CONTINUE TO
LOOSEN ITS GRIP OVER THE NERN PLAINS TODAY...WITH TEMPERATURES
WARMING A FEW MORE DEGREES TODAY...BUT STILL BELOW SEASONAL
AVERAGES. FOR TNGT...MSTR WILL INCREASE AHD OF AN EMBEDDED SHORT
WAVE THAT IS PROGGED TO MOVE ACROSS THE CWFA LATE TONIGHT. MDLS DO
NOT SHOW MUCH IN THE WAY OF QPF OVERNIGHT SO CONFINED THE SLIGHT CHC
OF SNOW TO ZONE 31. WINDS WILL PICK UP AFTER MIDNIGHT IN THE
MOUNTAINS OND FOOTHILLS...BUT SHOULD BE WELL BELOW ANY HIGHLIGHT
CRITERIA. ACROSS THE PLAINS...LOW LEVELS WILL REMAIN DRY BUT PARTLY
TO MOSTLY CLOUDY CONDITIONS SHOULD HELP MODIFY THE OVERNIGHT MINS
SOMEWHAT. OVERALL JUST MINOR ADJUSTMENTS PLANNED FOR THE GRIDS.
.LONG TERM...WESTERLY FLOW ALOFT WILL BE OVER THE CENTRAL ROCKIES
FROM SATURDAY THROUGH MONDAY. THIS PATTERN USHER IN WARMER PACIFIC
AIR ALONG WITH SOME MOISTURE. WILL SEE A CHANCE FOR MOUNTAIN SNOW
THROUGH MONDAY NIGHT. THE BEST CHANCE FOR SNOW WILL BE SUNDAY AS A
WEAK TROUGH RACES ACROSS THE STATE. ANY SNOW THAT FALL WILL BE ALONG
AND WEST OF THE CONTINENTAL DIVIDE...AND SHOULD BE LIMITED TO THE
MOUNTAINS. SNOWFALL AMOUNTS WILL BE ON THE LIGHT SIDE WITH HEAVIER
AMOUNTS OVER THE WESTERN PART OF THE STATE. EAST OF THE DIVIDE WILL
REMAIN DRY BECAUSE OF THE DOWNSLOPE FLOW.
AN ALBERTA CLIPPER WILL MOVE ACROSS THE NORTHERN STATES MONDAY.
MODELS INDICATE COOLER AIR WILL BE OVER THE REGION BECAUSE OF THE
TROUGH THAT MOVES ACROSS THE AREA SUNDAY. LOOKS LIKE THE ARCTIC AIR
ASSOCIATED THE CLIPPER WILL STAY NORTH AND EAST OF THE AREA.
ON TUESDAY AN UPPER LEVEL RIDGE BEGINS TO BUILD OVER THE WESTERN
U.S. TEMPERATURES WILL BEGIN TO WARM TUESDAY AND BY WEDNESDAY MOST
LOCATIONS OVER THE URBAN CORRIDOR AND EASTERN PLAINS WILL BE
FLIRTING WITH 50 DEGREES. AIRMASS WILL BE DRY UNDER THE RIDGE WITH
NO PRECIPITATION EXPECTED ANYWHERE FROM TUESDAY ON.
&&
.AVIATION...VFR CONDITIONS THROUGH THE PERIOD. SFC LEE TROF ALONG
THE FRONT RANGE MAY AGAIN CONTRIBUTE TO MAINLY SSELY SFC WINDS AT
DEN AND APA. GUSTY W-SWLY DOWNSLOPE WINDS POSSIBLE AT BJC THIS
MORNING...BUT NOT AS STRONG AS YESTERDAY.
&&
.BOU WATCHES/WARNINGS/ADVISORIES...NONE.
$$
COOPER/MEIER
