Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 162316
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
516 PM MDT Sat Sep 16 2017

.SHORT TERM...(This evening through Monday night)
Issued at 200 PM MDT Sat Sep 16 2017

Upper trough swinging across northern Wy into the northern plains
now with energy clipping the north part of the CWA and setting
off some showers. Expect these to move eastward for the rest of
the afternoon before ending. A cool surface high will settle over
the northern plains tonight and with clear skies should see a
chilly night. Min temps Sunday morning should get close to
freezing over parts of the northern and western CWA so have opted
to post a frost advy for those typically cool areas for later
tonight into Sunday morning.

Warmer temps make their return Sunday as the surface high moves
into the central plains and southerly winds set up over the CWA.
An impulse will move across the area late Sunday and set off some
showers and a few storms mainly east of the mtns Sunday afternoon
with activity moving across the Panhandle Sunday evening. Warm and
dry Monday with lee troughing over the high plains. Rather breezy
over western areas both Sunday and monday afternoon.

.LONG TERM...(Tuesday through Saturday)
Issued at 200 PM MDT Sat Sep 16 2017

A closed low over southwest Canada will remain nearly stationary
through the period. A series of upper troughs will impact the
Intermountain West, Rockies and High Plains. These systems and a
couple of cold frontal passages will maintain a showery pattern
through the week. Best opportunity for thunder will be Tuesday
afternoon with the first cold front moving through the CWA. It
will be quite breezy along and west of the Laramie Range Tuesday
with westerly winds gusting to 40 mph. Highest mountain elevations
could see a couple of inches of snow Tuesday night and Thursday
night. High Temperatures Tuesday through Thursday slightly above
seasonal normals, then cool to slightly below normal Friday and
Saturday after the second cold front.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 514 PM MDT Sat Sep 16 2017

Some concern with the return of stratus tonight, but it will be
more patchy than what we saw last night. Best locations using
latest HRRR would be KAIA and possibly KCYS. Trended TAFs for
these two airports. Will see what later HRRR output shows before
introducing more widespread IFR. Windy again Sunday.

&&

.FIRE WEATHER...
Issued at 200 PM MDT Sat Sep 16 2017

A cool night is expected tonight with some frost in low-lying areas,
mainly over western and northern districts. Warmer conditions will
return Sunday into early next week with dry weather for the most
part. A disturbance should set off some showers and a few storms east
of the mountains late Sunday into Sunday evening. Breezy conditions
will also occur over western districts both Sunday and Monday afternoon
but minimum humidities should stay generally above 25 percent both
days.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Frost Advisory from 2 AM to 8 AM MDT Sunday for WYZ101-102-105-
     109-115.

NE...None.
&&

$$

SHORT TERM...RE
LONG TERM...MAJ
AVIATION...GCC
FIRE WEATHER...RE



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