Area Forecast Discussion
Issued by NWS Grand Junction, CO

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102
FXUS65 KGJT 290558
AFDGJT

Area Forecast Discussion
National Weather Service GRAND JUNCTION CO
1158 PM MDT Fri Apr 28 2017

.UPDATE...
Issued at 1146 PM MDT Fri Apr 28 2017

An upper level low pressure system centered over the San Juan
Mountains will continue to provide snow to the mountains of the
Western Slope of Colorado overnight tonight into late Saturday as
moisture wraps around the system. This will result in periods of
moderate to locally heavy snow with additional accumulations of 3
to 6 inches expected. This snow will make traveling high mountain
passes difficult. Web cams show snow on Red Mountain Pass and icy
snow packed conditions on Vail pass. A Winter Weather Advisory
has been issued due to these conditions.

&&

.SHORT TERM...(Tonight through Saturday night)
Issued at 253 PM MDT Fri Apr 28 2017

Increasing clouds late tonight will prevent subfreezing
temperatures in the Grand Junction vicinity tonight, but mostly
clear skies will bring widespread freezing temperatures to the
central Gunnison, Uncompahgre and North Fork of the Gunnison river
valleys tonight.

A large trough centered over western CO will continue traveling
south as a strong shortwave trough develops on its western side.
This shortwave will travel quickly to New Mexico as it strengthens
causing the main low to travel into New Mexico late tonight. This
low will then move east and northeast to southeast CO late
tonight. As this low moves east, clouds will be draw from east to
west across the forecast area late tonight. These clouds will
spread over northwest and central CO preventing widespread sub-
freezing temperatures in the Grand Junction Vicinity.

Skies will clear again Saturday night which may lead to more
freezing temperatures over west-central Colorado.

.LONG TERM...(Sunday through Friday)
Issued at 253 PM MDT Fri Apr 28 2017

Sunday morning may be another cold one as skies are projected to
become mostly clear, allowing temperature to drop. A ridge will
build over the western U.S. Sunday with eastern Utah and western
CO on its eastern periphery. This will bring north winds over the
area keeping temperatures below seasonal norms through
Wednesday. Two weak shortwave troughs may clip the northern CO
zones Monday and Tuesday, but the rest of the area will be dry
through the week. By Thursday temperatures should warm to near
normal, then rise well above normal Friday.

&&

.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
Issued at 1146 PM MDT Fri Apr 28 2017

An upper level low pressure system centered over the San Juan
Mountains is resulting in mountain snow and the potential for low
elevation showers through late Saturday morning. Since this low is
centered over the San Juan Mountains which is in the southern
portion of the area of responsibility expect winds to slowly back
overnight into Saturday as the low exits to the east. For the most
part ceilings are expected to be MVFR to VFR with the exception of
Telluride which will see LIFR conditions through at least early
Saturday morning.

&&

.GJT WATCHES/WARNINGS/ADVISORIES...
CO...Winter Weather Advisory until noon MDT Saturday for COZ009-010-
     012-018-019.

     Freeze Warning until 9 AM MDT Saturday for COZ011.

UT...None.
&&

$$

UPDATE...Larry
SHORT TERM...CC
LONG TERM...CC
AVIATION...Larry



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