Area Forecast Discussion
Issued by NWS Cheyenne, WY

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362
FXUS65 KCYS 112140
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
240 PM MST Mon Dec 11 2017

.SHORT TERM...(This evening through Wednesday)
Issued at 240 PM MST Mon Dec 11 2017

Mild and dry weather will continue across the CWA through
Wednesday as the CWA remains under northwesterly flow. It
will be about 5-10 degrees warmer over the plains Tuesday
with sunshine and downslope flow along with warmer mid-level
temps. A clipper-type system will dive down the northern plains
Tuesday night and push a cool front across the CWA with max
temps Weds about 10 degrees cooler, along with windy conditions.
A weak shortwave passing across late Weds could bring a few
showers to mainly the mtns.

.LONG TERM...(Wednesday night through Monday)
Issued at 240 PM MST Mon Dec 11 2017

Main concerns this period will be with a couple potential wind
events. A cool and breezy day Thursday under fast northwesterly
flow while another clipper system scoots southeast over the
northern plains.  The cool surface airmass erodes out Thursday
night as lee troughing develops and deepens with some strong winds
possible in the wind-prone areas Friday as a surface trough works
eastward over the high plains. Warmer Friday ahead of the next
upper trough that should swing across Saturday, bringing another
cooldown and a better chance for some rain and snow showers. Cool
and breezy Sunday then warming again Monday with windy conditions
again, though not looking quite as windy as earlier. Still could
see a wind event for at least the wind-prone areas Sunday night
and early Monday. Mainly dry Sunday and Monday.

&&

.AVIATION...(For the 18Z TAFS through Tuesday morning)
Issued at 1032 AM MST Mon Dec 11 2017

VFR conditions through tonight. Midlevel cloudiness across the far
eastern plains will dissipate this evening. Very windy conditions
are expected across the far eastern SE Wyoming plains and western
Nebraska, where gusts between 30 to 40 kts are expected this
afternoon and into early this evening. Winds will be light after
03z.

&&

.FIRE WEATHER...
Issued at 240 PM MST Mon Dec 11 2017

Overall fire weather concerns look to be low as min humidities
will be increasing over the coming days. There will be some gusty
winds at times as weak systems pass near the region over the next
few days.

&&

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

$$

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



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