Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 090439
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
939 PM MST Fri Dec 8 2017

.UPDATE...
Issued at 930 PM MST Fri Dec 8 2017

Cloudiness all but gone over the CWA save for the far eastern
plains. Satellite pictures are showing no cloudiness upstream.
Will make some minor adjustment to grids.

&&

.SHORT TERM...(This evening through Saturday)
Issued at 130 PM MST Fri Dec 8 2017

Strong winds are beginning to subside this afternoon. Diminishing
trend will continue through sunset as boundary layer stabilizes.
Clouds will gradually clear through the evening as drier air moves
in from the north/northwest. With snow cover in the high mountain
valleys of North Park and Middle Park, inversions should
strengthen these days so will lower temps a few more degrees
tonight and Saturday. On the plains, shallow inversions tonight
should erode quickly on Saturday with nearly full sunshine and
a downslope component in place. Highs should reach 55-62 over most
of the plains, warmest near the foothills.

.LONG TERM...(Saturday night through Friday)
Issued at 130 PM MST Fri Dec 8 2017

A large 585 DM high remains over the western CONUS with strong NW
flow plunging down the east side of the ridge over Colorado. This
will keep the region under dry and unseasonably warm temperatures
through late next week. Highs will range from the upper 50s to
lower 60s in the extended with periods of gusty winds on the
plains bringing increased fire danger. On Monday a trough dropping
out of Canada will clip the NE portions of the state with a jet
dropping south by the afternoon. With the subsident side of the
jet over the eastern plains expect winds to increase Monday
afternoon with gusting between 30 and 35 mph possible. The winds
combined with RH values in the low teens will bring another round
of increased fire danger. A weak cold front will move south by the
morning hours helping to drop highs in the mid to upper 50s. As
the jet and associated trough push SE, flow will turn more WNW and
with the help of a building lee side low highs will rebound back
into the lower to mid 60s. By mid week the models are still
differing on the timing of an upper level feature moving south out
of Canada. As of this time however, both systems lack any
substantial moisture so no precipitation is expected.

&&

.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
Issued at 930 PM MST Fri Dec 8 2017

Winds not quite drainage right now; they are a little west of
normal drainage. Will go with drainage after 06Z. There will be
no ceiling issues.

&&

.FIRE WEATHER...
Issued at 130 PM MST Fri Dec 8 2017

Winds will be lighter tomorrow, but humidities will remain low.
Gusty winds to around 25 mph can still be expected over the
northern border area and eastern plains, so fire danger there
will be elevated but just shy of Red Flag criteria.

Winds will pick up again on Monday afternoon with gusts on the
plains reaching into the 30 to 35 mph range. RH levels will be in
the lower teens so critical fire weather conditions will be
possible...especially south of I-25 and over the far eastern
plains.

&&

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

$$

UPDATE...rjk
SHORT TERM...Barjenbruch
LONG TERM...Bowen
AVIATION...rjk
FIRE WEATHER...Barjenbruch



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