Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 100912
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
312 AM MDT Tue Oct 10 2017

.SHORT TERM...(Today through Wednesday)
Issued at 310 AM MDT Tue Oct 10 2017

Observations across the region show cold temperatures for this
time of the year with very cold temperatures around zero in the
Laramie Valley. Laramie Airport has been in and out of fog with a
low temperatures of -2 so far this morning, mainly because of
clear skies and a rare surface snowpack. Even outside of the
Laramie Valley, many locations are observing lows in the teens
this morning under clear skies and light winds. The Hard Freeze
Warning remains in effect for most of the western Nebraska
panhandle in addition to the north Platte River valley from Glendo
and Torrington.

Quiet and benign weather is expected today and on Wednesday with
locally windy conditions the only minor concern across the wind
prone areas late tonight and into Wednesday morning. Do not expect
High Wind criteria at this time with low probabilities overall,
but can not rule out gusts up to 50 MPH after midnight through
sunrise Wednesday near the Arlington and Bordeaux areas. Slow
warming trend will begin today with highs around 60 degrees across
western Nebraska, but temperatures only in the 40`s along and west
of the Laramie Range. The remaining surface snowpack is expected
to melt by late today, which will result in temperatures near
normal by Wednesday with highs in the upper 50`s to middle 60`s in
these locations. Further east, temperatures will moderate into the
low 70`s under southwest flow aloft.

.LONG TERM...Wednesday Night through Monday...

The beginning of the extended period will start out quite pleasant
across the region.  A shortwave trough will move across northeast
Montana on Thursday with little impact on the sensible weather over
the CWA, except to drag a weak front across the plains late in the
day.  Thursday will likely be the warmest day with highs reaching
into the upper 50s to low 70s.  Isentropic lift over the northern
Panhandle and Niobrara counties may produce rain showers on Thursday
night.  The models have been in rather good agreement at showing an
upper trough digging into Idaho on Friday, and then swinging
overhead on Saturday aftn/evening.  It will be breezy behind the
fropa, however this is a rather progressive system which will limit
QPF amounts.  Temps will moderate some on Sunday, but moreso by
early next week as zonal flow aloft becomes established over the
Intermountain West.

&&

.AVIATION...(For the 12Z TAFS through Tuesday night)
Issued at 303 AM MDT Tue Oct 10 2017

KLAR will continue to observe periods of IFR conditions and fog
this morning, although the frequency of IFR conditions will likely
be lower prior to sunrise based on IR satellite. Otherwise, VFR
conditions are expected elsewhere with quiet weather. South to
southwest winds may become breezy this afternoon, mainly around
KRWL.

&&

.FIRE WEATHER...
Issued at 203 AM MDT Tue Oct 10 2017

No Fire Weather concerns this week due to cool temperatures and
recent rain and snowfall. It will trend warmer by the middle of
the week with temperatures moderating into the 70`s across the
eastern plains.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Hard Freeze Warning until 9 AM MDT this morning for WYZ107-108.

NE...Hard Freeze Warning until 9 AM MDT this morning for NEZ003-
     019>021-054-055.

&&

$$

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



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