Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 081010

Area Forecast Discussion
National Weather Service Denver/Boulder CO
310 AM MST Fri Dec 8 2017

.SHORT TERM...(Today and tonight)
Issued at 310 AM MST Fri Dec 8 2017

North-Northeast flow aloft will prevail today around the upper
level ridge over western North America. Looking upstream, appears
there will be enough moisture for mostly cloudy to partly cloudy
skies for today. Light snow/flurries are occurring over parts of
the foothills and mountains. Have this ending mid morning as drier
air works its way into the state. Any additional accumulation
should be light and less than an inch.

Winds are already gusting to 40 knots across eastern Wyoming and
western Nebraska. These winds will spread into the area this
morning. Gusts to around 50 mph are expected this morning and
early afternoon over the eastern plains. Localized gusts close to
60 mph will be possible over downslope favored area along the
Cheyenne Ridge and Palmer Divide. Warm air advection is already
occurring and will continue today. Highs will climb into the 50s
for most of northeast Colorado.

.LONG TERM...(Saturday through Thursday)
Issued at 310 AM MST Fri Dec 8 2017

Few changes noted in the 00z and 06z/Fri model runs. Large
blocking ridge pattern will remain the dominate weather maker
across the western CONUS for the foreseeable future. Colorado on
the east side of this ridge will also remain under a moderately
strong northwesterly flow aloft. Weak to moderate subsidence
contributing to drying and warming aloft and a west-to-east cross
state pressure gradient will keep precip chances near zero and a
low-level downslope flow off the Front Range. However, around the
middle of next week, both the GFS and ECMWF show the Great Basin
ridge retreating westward, enough to allow a weak Alberta clipper
system to race across nern Colorado sometime on Wednesday. Do not
see much in the way of moisture with it, though enough cool air
and gusty nwly winds to drop temperatures by about 5 deg f on
Wednesday and another 5-8 deg F on Thursday. Thursday also looks
pretty windy, esply acrs the northeast corner of the state in the
vicinity of a tight baroclinic zone sitting just east of the area.
Otherwise, temperature readings should remain above average
through the entire period, with warmest readings on Sunday and
Tuesday when highs on the plains should again manage to reach the
lower 60s. Normal highs for nern Colorado this time of year
average in the low to mid 40s, with high country highs running
anywhere from the mid teens near timberline to mid 30s on the
alpine basin floors.


.AVIATION...(For the 12Z TAFS through 12Z Saturday morning)
Issued at 310 AM MST Fri Dec 8 2017

Expect mid and high clouds to continue to stream across the area
today. Ceilings in the Denver area will remain above 8000 feet.
Gusty north-northwest winds will develop around 16Z. Gusts to 30
knots will be possible at KDEN and KAPA through late afternoon,
23Z. For tonight, skies will clear and winds will become a normal
southerly drainage direction at KDEN and KAPA early in the
evening, 03-04Z.


Issued at 310 AM MST Fri Dec 8 2017

Strong northerly winds with gusts to 50 mph over eastern Colorado
will prevail this morning and early afternoon. Relative
humidities are expected to fall into the teens this afternoon with
values slowing increasing to the east. Will continue with the Red
Flag Warning for much of the eastern plains today.


Red Flag Warning from 10 AM this morning to 5 PM MST this
afternoon for COZ238-241>249.



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