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Area forecast discussion
National Weather Service Denver/Boulder Colorado
339 PM MST Mon Jan 22 2018

Short term...(this evening through tuesday)
issued at 339 PM MST Mon Jan 22 2018

Current satellite analysis shows a weak short wave moving through
western Wyoming and northern Utah this afternoon. This feature
will reach the mountains this evening with light snow developing.
Moisture is rather shallow and lapse rates are poor, so only a
couple inches expected in the northern mountains, and maybe a few
flurries reaching the Mountain Valley floors. Clouds will also
increase across the plains from west to east starting this
evening. The exact timing of increased clouds and some breeze will
make low temperature forecasts a little tricky for tonight. For
now, will go toward the colder end of guidance with the fresh snow

For Tuesday, sunshine should return to the plains as mid level
moisture plume shifts to the east. Lingering mountain snow showers
will also decrease with drying aloft, but gusty winds in the
mountains will produce some blowing snow in exposed areas.
Otherwise, mainly light winds but sufficient mixing to keep any
valley inversions weak through Tuesday.

Long term...(tuesday night through monday)
issued at 339 PM MST Mon Jan 22 2018

Tuesday night into Wednesday, an upper ridge will be building over
the area allowing for warm air advection and downsloping over the
foothills due to the increased atmospheric stability. Therefore
Tuesday night minimums were increased across the foothills and
urban corridor. Wednesday's maximum temperatures were decreased a
few degrees over the eastern plains to account for snow
accumulation from the last snow storm.

Winds will increase Thursday night as an upper level jet moves
into the state. Wind gusts could reach 60 mph over the higher
mountain passes. Models are bringing the next Pacific system to
the northern mountains Thursday night into Friday. The GFS has
shown the snow beginning over the northern mountains Thursday
night, while the European shows a stronger, slower system dipping
farther south. Current forecast accounts for both solutions with a
chance of snow over the mountain Thursday night through Sunday.


Aviation...(for the 18z tafs through 18z Tuesday afternoon)
issued at 339 PM MST Mon Jan 22 2018

VFR conditions will persist through Tuesday. High and mid level
clouds will spread into the area 00z-06z with ceilings possibly
down into the 8,000-10,000 foot range 06z-12z. Some northerly
wind component possible til around 01z before winds turn back to
normal south/southwest and hold there through about 18z Tuesday.
Kbjc winds have also backed off this afternoon and should stay
lighter westerly through Tuesday morning.


Bou watches/warnings/advisories...

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