Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 040311
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
811 PM MST Sat Dec 3 2016

.UPDATE...
Issued at 807 PM MST Sat Dec 3 2016

No significant changes to the grids at this time, only slight
adjustments to winds and temperatures this evening.

&&

.SHORT TERM...(This evening through Sunday)
Issued at 313 PM MST Sat Dec 3 2016

Weak upper ridging will cover the state tonight and Sunday with
subsidence in place. Some mid level moisture trapped over the
mountains will keep isolated light snow showers over the mountain
ridges through this evening, but as the subsidence increases
tomorrow, precipitation in the mountains will come to an end.
Temperatures should warm up a few degrees due to the northwesterly
flow in place at mid levels. Benign conditions should prevail
through the next 24 hours.

.LONG TERM...(Sunday night through Saturday)
Issued at 313 PM MST Sat Dec 3 2016

Sunday night through Monday an upper level trough of low pressure
deepens over the northern and central Rockies...with a moderate
to strong westerly flow aloft over Colorado. At the
surface...there will be lee troughing and downsloping flow east of
the mountains. This pattern will produce above normal
temperatures across the plains and Palmer Divide...with breezy
conditions possible across far northeastern sections of the state.
Increasing moisture and orographics combined with cold air
advection and lift from an approaching upper level jet will result
in some light snow and breezy conditions in the high country as
well. The atmosphere will be quite
unstable...therefore...scattered snow showers may spill over the
Divide and into the higher foothills.

Monday night a cold front is expected to move across northeastern
Colorado...with much colder temperatures expected across the plains
on Tuesday. Initially...the atmosphere looks somewhat dry at the
surface...however...weak upslope flow and QG lift could produce
scattered light snow showers and flurries east of the mountains
through the day. A moist westerly flow aloft will continue to
produce light to moderate snow at times in the mountains.

Late Tuesday...an Arctic cold front is expected to move across
northeastern Colorado. Upslope flow behind the front combined...
with QG lift from the jet...should produce snow across the
foothills...plains and Palmer Divide from Tuesday evening through
Wednesday morning. The snow should generally be
light...however...CSI banding could produce localized heavier
bands at times. Light snow should also continue across the high
country...with a few heavier CSI snow bands possible...mainly
along and south of Interstate 70.

The snow should decrease across north central and northeastern
Colorado by noon Wednesday as the upper trough moves into the
central plains states and upslope flow and QG lift decrease.
Wednesday should be the coldest day of the week with max
temperatures in the the teens on the plains. By Thursday
morning...some plains locations could see the temperatures drop
below zero.

Upper level high pressure building over the Rocky Mountain Region
will bring warmer and drier weather to the area for the end of the
work week with near normal temperatures expected by Friday. Another
storm system could bring another round of snow to the high
country by next weekend.

&&

.AVIATION...(For the 06Z TAFS through 06Z Sunday night)
Issued at 807 PM MST Sat Dec 3 2016

VFR through Sunday evening. Light drainage winds overnight.
A developing lee trough Sunday morning will also keep light winds
in place along the foothills. Aviation impacts will be minimal.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

UPDATE...Cooper
SHORT TERM...Dankers
LONG TERM...Kalina
AVIATION...Cooper



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