Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 120505 RRA
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
1005 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 06Z TAFS through 06Z Tuesday evening)
Issued at 1005 PM MST Mon Dec 11 2017

VFR. FEW-SCT high clouds through Tuesday morning, then clear. Light
surface winds overnight, becoming breezy from west-northwest after
16Z Tuesday. Occasional gusts of 20 to 25 KT at KCYS, KRWL and KSNY
Tuesday afternoon.

&&

.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...MAJ
FIRE WEATHER...RE



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