Area Forecast Discussion
Issued by NWS Cheyenne, WY

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757
FXUS65 KCYS 160534
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
1034 PM MST Mon Jan 15 2018

.SHORT TERM...(This evening through Tuesday)
Issued at 228 PM MST Mon Jan 15 2018

Arctic high pressure will build into Plains tonight. As a result,
wind speeds on the back side of this high pressure system will
drop off quickly and allow for strong radiational cooling to take
place across areas east of the Laramie Range. We went ahead and
moved up the Wind Chill Advisory to 9pm since we will be radiating
out fairly quickly in the Panhandle, but wind speeds will be much
lighter than earlier today. Tuesday we should see a decent
recovery in temperatures as downslope flow kicks in. After a
bitter cold start temperatures should be able to climb to the 20s
and 30s.

.LONG TERM...(Tuesday night through Monday)
Issued at 228 PM MST Mon Jan 15 2018

Another shortwave is expected to ride along the Canadian/U.S.
border on Wednesday night into Thursday. This will induce height
falls along the Laramie Range and increase the pressure gradient
in the west. As a result, we will see wind speeds increase across
the wind corridors on Wednesday night into Thursday. These strong
wind speeds may persist into Friday before the next shortwave
dives into the central Rockies. The models continue to be in
pretty good agreement with moving this shortwave trof through much
of the intermountain west before closing off over eastern
Colorado on Sunday morning. This will provide large scale upper
level diffluence, jet energy and deep moisture. At this point,
snow chances are still looking pretty good for the southern half
of Wyoming from Friday night through Saturday night. The good
residence time of this system will favor potential significant
snowfall amounts as well. Stay Tuned!

&&

.AVIATION...(For the 06Z TAFS through 06Z Tuesday night)
Issued at 1031 PM MST Mon Jan 15 2018

VFR. In general, SKC conditions are expected w/ perhaps a few high
clouds spreading across the area by Tue afternoon. Winds should be
light for much of the area, except for gusts near 20 knots at KRWL
on Tuesday afternoon.

&&

.FIRE WEATHER...
Issued at 228 PM MST Mon Jan 15 2018

Fire weather concerns will be quite limited tonight and tomorrow,
due to plenty of snow cover and very cold temperatures. Wind
speeds will increase on Wednesday night-Friday across areas along
and west of the Laramie Range. However, minimum relative humidity
values will continue to range from 25 to 35 percent. More snow
will be coming to the area this weekend.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...Wind Chill Advisory until 9 AM MST Tuesday for NEZ002-003-021-
     055-095-096.

&&

$$

SHORT TERM...REC
LONG TERM...REC
AVIATION...CLH
FIRE WEATHER...REC



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