Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 092332
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
430 PM MST Sat Dec 9 2017

.SHORT TERM...(This evening through Sunday)
Issued at 107 PM MST Sat Dec 9 2017

Main concerns in the near term are with higher wildfire danger
across the southern 2/3rds of the western Nebraska Panhandle
through late this afternoon in areas that have seen little if any
precipitation over the past couple of weeks. See fire weather
section in this discussion for details. Otherwise, breezy and dry
conditions expected the rest of this afternoon with not much
really to talk about for the rest of the weekend as a large ridge
of high pressure parked over the western states keeps any passing
upper level systems to our north and east, as well as any deep
cold air intrusions. Winds for tomorrow look to be lighter than
what we are seeing today, although the models are pointing to 30
to 40 mph winds in the wind prone gap areas (Bordeaux, Arlington).

.LONG TERM...(Sunday night through Saturday)
Issued at 107 PM MST Sat Dec 9 2017

Over the next couple of days we expected to see the large upper
ridge to our west retreat a bit westward allowing a weak upper
system and modifying cold front to move down east of the Laramie
Range on Monday, with a stronger fast moving clipper system still
being advertised in the 12Z runs moving down into Nebraska on
Wednesday (with a slightly stronger cold front). Neither of those
systems through Wednesday look to produce any precipitation given
very limited moisture. Our next chance at precipitation looks to
be setting up for late Friday into Saturday as the upper ridge to
the west weakens allowing a larger upper system to move down
across our area. Right now we are carrying snow chances starting
Friday night, but nothing that looks overly significant impact-
wise right now given the progressive,fast moving character of the
system.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday afternoon)
Issued at 430 PM MST Sat Dec 9 2017

VFR. Breezy at times this evening and again late Sunday morning
through Sunday afternoon for the terminals east of the Laramie
Range, with gusts of 20 to 25 kt.

&&

.FIRE WEATHER...
Issued at 107 PM MST Sat Dec 9 2017

Will maintain the Red Flag Warning across the southern 2/3rds of
the western Nebraska Panhandle through 5 PM. RH values most
reporting stations in zones where the fuels are in yes status
running 10 to 15 percent with winds 30 to 40 mph. Another day of
low humidity expected tomorrow although winds will be a bit
lighter most areas, so will hold off on any Fire Weather Watches
for Sunday.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...Red Flag Warning until 5 PM MST this afternoon for NEZ312-313.

&&

$$

SHORT TERM...JG
LONG TERM...JG
AVIATION...MAJ
FIRE WEATHER...JG



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