Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 050532
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
1030 PM MST Mon Dec 4 2017

.SHORT TERM...(This evening through Wednesday night)
Issued at 200 PM MST Mon Dec 4 2017

Cold front has pushed well south and east of the Cheyenne CWFA
this afternoon with winds and snow easing. All wind and winter
headlines have been dropped this afternoon as high pressure builds
into the area.

A pretty cold night in store for all locations as overnight lows
fall into the single digits west of the Laramie Range and mid
teens east over the Nebraska Panhandle. Windchill temperatures
expected to fall to the single digits below zero out west and
single digits above zero in the Panhandle. Bundle up tonight if
going outside as there will be a small risk of cold related
injuries with these types of temperatures and windchills. Be
thinking of your four legged friends that stay outside and keep
them warm.

Warmer temperatures Tuesday as we transition back to a more
westerly downsloping weather pattern. Temperatures out west of the
Laramie Range will struggle though with snowpack and cold 700mb
temperatures around -11 to -12C. Mid to upper 20s for highs out
west with upper 30s/low 40s east.

.LONG TERM...(Thursday through Monday)
Issued at 1252 PM MST Mon Dec 4 2017

Thursday...Slightly warmer than Wednesday with rising heights and
thicknesses, although still cold and windy based on progged low and
mid level gradients and cool north flow aloft, limiting warming.

Friday...Warming trend begins in earnest as the flow aloft backs
slightly and heights and thicknesses rise.

Saturday...Flow aloft backs even moreso, to northwest, inducing
better surface lee troughing and producing a slow warming trend as
low level winds become west. Continued dry with lack of low and
mid level moisture.

Sunday...Temperatures likely cooler than Saturday as another
shortwave trough aloft and dry cold front cross our counties.

Monday...Continued windy and cool based on progged surface through
700 mb winds and gradients, along with expected 700 mb temperatures
near -5 Celsius.

&&

.AVIATION...(For the 06Z TAFS through Tuesday evening)

VFR conditions are expected tonight through Tuesday afternoon. There
is a slight chance of some fog west of Interstate 25 tonight near
KLAR, but confidence remains low so far due to winds around 10 to 15
knots. Windy conditions are expected across southeast Wyoming and
western Nebraska on Tuesday with gusts up to 35 knots after 16z.

&&

.FIRE WEATHER...
Issued at 200 PM MST Mon Dec 4 2017

Expect winds to ease through the afternoon hours this afternoon. A
strong cold front moved through the area this morning with very
cold temperatures behind the front. Most areas along and west of
the Laramie Range received accumulating snowfall, so fire weather
concerns are marginal at least through Tuesday. Gusty west winds
return Wednesday...but afternoon humidity expected to remain well
above critical levels.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&

$$

SHORT TERM...GCC
LONG TERM...RUBIN
AVIATION...TJT
FIRE WEATHER...GCC



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