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Area forecast discussion
National Weather Service Denver/Boulder Colorado
135 PM MST sun Dec 15 2019

Short term...(this evening through monday)
issued at 135 PM MST sun Dec 15 2019

What is left of a weak upper level trough will move across
southern Colorado tonight. Moisture associated with this system
will continue to produce some light snow over the southern part of
the forecast area. The best chance of snow will remain mainly
south of Interstate 70. For Denver, there will be a slight chance
of snowfall until around 8 am Monday morning. On Monday increasing
mid and upper level stability will develop behind the exiting
trough. The flow aloft will be dry, weak and northwesterly for
Monday afternoon. Continued cooler than normal temperatures but
more sunshine especially in the afternoon.

Long term...(monday night through sunday)
issued at 135 PM MST sun Dec 15 2019

By Monday evening, the upper trough will have shifted southeast
bringing Colorado into northwest flow aloft. Weak moisture embedded
in the flow could bring some light snow to the northern mountains
overnight into Tuesday with little to no additional accumulation
expected. Levels will dry out Tuesday with an upper ridge building
in to the region. This dry period will last through Wednesday with
temperatures warming into the mid 50s on the plains with the help of
increased downslope warming provided by a Lee side low.

A trough will be across southern Idaho and Utah and will progress
eastward into central Colorado by Thursday afternoon. Models are not
excited with this system as moisture seems to be lacking. Will
maintain a slight chance of snow over the higher elevations of the
northern and central mountains while keeping the plains dry.
Temperatures will drop around 5-8 degrees from Wednesday under
mostly cloudy conditions. Model cross-sections show winds increasing
across the higher elevations with speeds up to 45 mph possible.

Behind the exiting trough upper level ridging will build in bringing
dry and warming conditions through Monday. Highs could reach 10 to
15 degrees above normal by the weekend.


Aviation...(for the 18z tafs through 18z Monday afternoon)
issued at 135 PM MST sun Dec 15 2019

Overall expected VFR conditions through midday Monday. There is
the potential for light snow until around 15z Sunday, but much of
this should remain south of the terminals. If it does slip
further north, then could see some ils restrictions with broken
ceilings 040-050. Generally light winds (under 10 kts) shifting
to a southerly drainage overnight, then southwest/west on Monday.


Bou watches/warnings/advisories...

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