Area Forecast Discussion
Issued by NWS Grand Junction, CO

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FXUS65 KGJT 122252

Area Forecast Discussion
National Weather Service GRAND JUNCTION CO
352 PM MST Tue Dec 12 2017

.SHORT TERM...(Tonight through Wednesday night)
Issued at 322 PM MST Tue Dec 12 2017

Yet another pleasant day on tap thanks to the high pressure to our
west while temperatures are running anywhere from 1 to 6 degrees
warmer than yesterday. For the overnight, we can expect similar
temperatures to what we`ve seen recently as minimal cloud cover
will allow for decent radiational cooling.

On Wednesday, clouds will be on the increase across the CWA from
north to south as the jet stream starts digging southward. The jet
will support a short wave that is progged to move through the
area from Wednesday evening through midday Thursday. These clouds
may keep temperatures a few degrees cooler than those seen today
but not much modification anticipated. Since the short wave will
be dropping down from Canada, there won`t be significant moisture
for the wave to work with. Having said that, models continue to
show 1 to 2 inches, maybe as much as 4 inches for the higher
elevations of the northern and central mountains, less for the San
Juans. The northern valleys may also see a few snow showers but
minimal to no accumulations expected at this time.

.LONG TERM...(Thursday through Tuesday)
Issued at 322 PM MST Tue Dec 12 2017

Some lingering snow showers will continue for the Rockies during
the day Thursday but significant accumulations are not expected.
Some clearing will commence from noon onwards Thursday but high
temperatures will drop 3 to 5 degrees thanks to the short wave
ushering in some cooler air to the area. Friday looks to be a nice
day with some high clouds moving overhead from time to time.

On Saturday, another shortwave will set its sights on eastern Utah
and western Colorado. Upper level support for this feature will be
a bit more robust than the wave on Thursday with a deeper trough
and upper level jet eventually forming a closed low over the four
corners region before moving into Arizona and New Mexico. Precip
looks to start around noon Saturday up north before slowly
shifting southward through Sunday evening. High temperatures also
look to drop off by about 5 to 10 degrees as another shot of cold
air moves in.  Of course, the European is showing another quick
wave moving through with minimal moisture so the end result
remains up in the air. More to come on this next system.

Conditions improve Monday giving way to sunny skies Tuesday with
the next chance for any significant precipitation looking to be
the end of next week.


.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 1019 AM MST Tue Dec 12 2017

Widespread VFR conditions will continue to prevail across the
region as a strong upper level ridge remains overhead. Winds will
be light and variable through the next 24 hours.




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