Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 110954

Area Forecast Discussion
National Weather Service Denver/Boulder CO
254 AM MST Sat Nov 11 2017

.SHORT TERM...(Today and tonight)
Issued at 215 AM MST Sat Nov 11 2017

A fairly strong west to northwesterly flow aloft will be over the
region. A mid level trough axis will pass across northern CO this
afternoon as the system passes across eastern MT/WY. Isolated to
scattered snow showers will be possible primarily in zones 31 and
33 this afternoon, then increasing mid level subsidence will
develop tonight as the system exits and an upper level ridge moves
into the Rocky Mountain region. Gusty westerly winds will be
confined primarily to the mountains and higher foothills this
afternoon and evening.  As far as the northeast plains of CO are
concerned, a stubborn area of fog will linger over the far eastern
zones, east of a line from around Sterling to Akron to Hugo.
Latest GOES satellite imagery show this line slowly shifting east
early this morning. The trend at least should be for this line to
continue its gradual shift east through the mid morning hours.
Otherwise, dry with seasonal temperatures in the mid to upper 50s.
A weak front associated with the passing disturbance to the north
will push across the northeast plains this evening. Only effect
from this dry cool front will involve the north/northeasterly wind
shift this evening. Overall prospects of any fog over the
northeast plains tonight appear to be low and confined to areas
well to the north and east of Denver.

.LONG TERM...(Sunday through Friday)
Issued at 215 AM MST Sat Nov 11 2017

A fast moving westerly flow aloft will prevail over much of the
country Sunday and through the upcoming week. It will be cooler
Sunday behind a cold front. Most locations over northeast Colorado
will see highs in the 50s, though low lying areas across the
northern Front Range may only reach the 40s.

Ridging will move across the Central Rockies Monday. Flow aloft
turns southwesterly behind it on Tuesday. This will usher in mild
temperatures with highs in the 60s over northeast Colorado. A weak
embedded trough in the flow aloft will pass north of Colorado
late Tuesday. Light snow and windy conditions will be possible
over the northern mountains. A cold front associated with this
system will push south across eastern Colorado late Tuesday. This
and northwest flow aloft will result in cooler readings for

For Thursday, a fasting moving trough will move across the
Northern and Central Rockies. Models still trying to resolve the
timing of this system, though they have improved from 12 hours
ago. Timing of this system should be mid to late Thursday. This
system should bring a shot of snow to the mountains. A few weak
showers could briefly survive east of the mountains, otherwise dry
conditions are expected to persist. Highs are little more
uncertain for Thursday and Friday. Will keep readings near to
slightly above normal.


.AVIATION...(For the 12Z TAFS through 12Z Sunday morning)
Issued at 215 AM MST Sat Nov 11 2017

Overall expect vfr conditions over the next 24 hours with no
restrictions. Will keep MVFR vsby of 5sm in fog/haze at KDEN
until 13-14z then p6sm. Winds southwest this morning then light
north/northwesterly by this aftn. A weak front will allow for
period of northeast winds early this evening, then transitioning
to southeast/southerly overnight. Winds speeds generally at or
below 10 kts.




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