Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 060544
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
1045 PM MST Tue Dec 5 2017

.SHORT TERM...(This evening through Thursday Night)
Issued at 1251 PM MST Tue Dec 5 2017

Tonight...Next weak shortwave trough aloft and its associated cold
front move across our counties and with minimal low or mid level
moisture, precipitation looks quite unlikely. A cold and blustery
overnight, especially across our northeast counties where decent
mixing winds will continue all night.

Wednesday...Flow aloft is north behind the passing shortwave trough
aloft and reinforcing shot of cold air. Expect a windy and cold day
as 700 mb temperatures cool off to near -17 Celsius with decent
surface to 700 mb gradients yielding windy conditions, especially
east of Interstate 25.

Wednesday night...Few snow showers expected as a weak shortwave
trough aloft moves overhead, though limited low and mid level
moisture will limit snowfall coverage. Quite cold in the incoming
airmass.

Thursday...With a weak shortwave trough aloft passage and some low
and mid level moisture, will see isolated to scattered snow showers,
mainly west of Interstate 25. Perhaps a few degrees warmer as the
airmass moderates, though still breezy and cool.

.LONG TERM...(Friday through Tuesday)
Issued at 1251 PM MST Tue Dec 5 2017

Friday...Although north flow aloft continues, the abrupt rise in
heights and thicknesses suggests a significant warming trend as the
airmass moderates with 700 mb temperatures near -4 Celsius, yielding
maximum temperatures in the 40s east of I-25.

Saturday...Continued temperature moderation as the flow aloft backs
to north northwest and heights and thicknesses rise.

Sunday...Continued seasonably mild, though perhaps a few degrees
cooler with a bit more cloud cover.

Monday...Cooler temperatures once again in the wake of another cold
frontal passage due to a shortwave trough aloft passage across the
northern Plains states, including the Dakotas.

Tuesday...Seasonably mild based on heights and thicknesses rising
aloft and with some mid clouds projected on the back portion of
the upper trough.

&&

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

VFR conditions are expected across the southeast Wyoming terminals
through Wednesday morning.  There is potential for MVFR CIGS across
the western Nebraska terminals and some snow flurries early
Wednesday morning as an arctic front slides south across the plains.
MVFR CIGS have been observed across western South Dakota and far NE
Wyoming as well, so expect similar conditions over KCDR and KAIA
sometime early Wednesday morning.  A brief snow showers is possible
as well briefly limiting visibilities to one mile at times. Winds
will increase by 12z Wednesday morning, with north to northwest
gusts between 30 to 40 knots possible across the eastern plains.

&&

.FIRE WEATHER...
Issued at 1251 PM MST Tue Dec 5 2017

Minimal concerns, though will see humidities lowering by the end
of the week and the weekend. Continued windy based on progged low
and mid level gradients.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...

WY...None.
NE...None.
&&

$$

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



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