FXUS65 KGGW 251038
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
338 AM MST WED NOV 25 2009
.SHORT TERM...FOR NORTHEAST MONTANA...TODAY THROUGH FRIDAY...
SHORT TERM PERIOD DOMINATED BY UPPER RIDGE SLIDING ACROSS THE REGION
WITH AS UPPER TROF PUSHES INTO THE PACIFIC NORTHWEST. THIS WILL
PUMP WARMER AIR ACROSS THE DIVIDE WITH TEMPERATURE EXPECTED TO BE
WELL ABOVE NORMAL FOR THE THANKSGIVING HOLIDAY AND AS WELL AS
BLACK FRIDAY.
WARM AIR ADVECTION AND LEE TROF WILL KEEP DOWNSLOPE WINDS FROM
MIXING MUCH THIS FAR OUT INTO THE PLAINS. GENERALLY EXPECT LIGHT
SOUTHERLY WINDS THROUGH THE PERIOD. DOWNSLOPE WILL ALSO KEEP
CONDITIONS DRY...ALTHOUGH SOME HIGH LEVEL CLOUDS WILL MOVE ACROSS
THE REGION WITH FORMATION OF CHINOOK ARCH. EBERT
.LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...
FRIDAY NIGHT THROUGH SATURDAY NIGHT... AFTER A FRONT PASSES
THROUGH THE REGION A THE BULK OF THE COLD AIR INVOLVED WITH IT'S
TROUGH SHOULD FOLLOW QUICKLY BEHIND. ON THE NORTHWEST FLOW PATTERN
WILL BE CAA WHICH WILL ALLOW SOME LOWS TO REACH INTO THE TEENS.
BEST CHANCE FORE PRECIPITATION IN THIS PERIOD WILL BE WITH A
SHORTWAVE THAT DEVELOPS OVER CENTRAL SASKATCHEWAN AND MOVES DOWN
INT NORTH DAKOTA CLIPPING THE NORTHEASTERN PORTION OF OUR CWA. 850
TEMPS WILL BE IN THE NEGATIVE SINGLE DIGITS.
SUNDAY THROUGH MONDAY... THE LAST GASP OF RELATIVELY WARM AIR
WITH SOME CHINOOKING WILL OCCUR BEFORE COLD AIR RAPIDLY CHANGES.
HIGH PRESSURE ALONG WITH WEST TO SOUTHWEST WINDS ARE ANTICIPATED.
DAYTIME HIGHS MAY REACH THE UPPER 30S TO MID 40S ACROSS THE
REGION. 850 TEMPS DURING THIS GROUP OF PERIODS WILL BE IN THE
POSITIVE SINGLE DIGITS.
MONDAY NIGHT THROUGH WEDNESDAY NIGHT... THE BOTTOM DROPS OUT WITH
TEMPERATURES AS A COLD FRONT MOVES THROUGH MONDAY NIGHT THROUGH
TUESDAY. DIRECTLY BEHIND THIS FRONT WINDS ARE ANTICIPATED TO
STRENGTHEN DUE TO THE PRESSURE GRADIENT FORCE ASSOCIATED WITH THE
STRONG CAA AND STRONG TEMPERATURE GRADIENT ACROSS THE FRONT. 850
TEMPERATURES WILL REACH DOWN INTO THE NEGATIVE TEENS WITH SURFACE
HIGHS IN THE 20S AND 30S AND LOWS IN THE LOWER 20S AND TEENS. GAH
&&
.AVIATION...
VFR WITH LIGHT AND VARIABLE WINDS TODAY THROUGH TONIGHT. GAH
&&
.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.
&&
$$
WEATHER.GOV/GLASGOW
