Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 242202

Area Forecast Discussion
National Weather Service Denver/Boulder CO
302 PM MST Tue Jan 24 2017

.SHORT TERM...(This evening through Wednesday)
Issued at 228 PM MST Tue Jan 24 2017

upper trough over central Nebraska with a weak northwesterly flow
aloft over northeast Colorado. NAM12 spatial cross-sections keeps
shallow upslope with the best moisture at or below 700 mb through
this evening. Could see some light snow develop near the foothills
and Palmer Divide through 03z. Will go with likely pops there but
with minimal accumulations of an inch or less. Elsewhere mostly
cloudy with generally isolated pops across the northeast plains.
Will allow the winter weather advisory for zone 31 to run its
course through 5 pm this afternoon. Some light snow there but
accumulations less than 3 inches. Overall just some weak mid level
qg over the region this evening then weak mid level subsidence
late tonight and Wednesday. Continued cold on Wednesday with
highs near 30.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 228 PM MST Tue Jan 24 2017

An upper trough is over the CWA Wednesday night into Friday with
weak westerly flow aloft. The upper trough axis moves across the
CWA through the day Friday with northwesterly flow aloft into
Saturday morning. The QG Omega fields show downward motion for the
CWA all five periods. The boundary layer winds are dominated by
northwesterly downsloping most of the time Wednesday night through
Friday night. The foothills and adjacent plains could get some
normals drainage winds mixed in during the overnight periods. For
moisture, there is still some progged in the mountains Wednesday
night into early Friday morning. Moisture decreases Friday, and
Friday night is pretty dry. There is some mid level moisture for
the plains Wednesday night into Thursday evening, then it is
pretty dry. The QPF fields have a bit of measurable snowfall over
the high mountains, and especially over zone 31 through Thursday
night, then nothing. For pops will go the "chance"s in the high
mountains Wednesday night into Thursday evening, then decrease
the pops to nothing by Friday morning. No pops for the plains.
For temperatures, Thursday`s highs are close to Wednesday`s highs.
Friday`s highs are 2-4 C warmer than Thursday`s. For the later
days, Saturday through Tuesday, models have strong northerly flow
aloft on Saturday then upper ridging moves in through Tuesday. The
airmass is pretty dry. Temperatures warm up to normals by
Saturday, then a bit above normals Sunday and Monday.


.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 228 PM MST Tue Jan 24 2017

Generally MVFR cigs through 03z with visiblities restricted in
the 3-5 mile range with any snow showers. No accumulations
anticipated on the grass/runways.  light northeast winds this
evening then transitioning to drainage. ILS cigs 04-08z tonight
then VFR ceilings and visibilities with no restrictions. Light
northwest winds expected for Wednesday aftn.


Winter Weather Advisory until 5 PM MST this afternoon for COZ031.



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