Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 121122

Area Forecast Discussion
National Weather Service Cheyenne WY
422 AM MST Tue Dec 12 2017

.SHORT TERM...(Today through Thursday)
Issued at 300 AM MST Tue Dec 12 2017

Not much change from what we have been seeing across southeast
Wyoming and Nebraska Panhandle in the short term.

Currently...Clipper system that brought the stronger winds to the
Nebraska Panhandle well east this morning allowing for a decreased
pressure gradient over the area. Winds generally pretty light
across the area this morning, generally under 10 mph. IR satellite
imagery showing clear skies over much of the western U.S. this
morning as upper high pressure remains firmly in control of the
weather across the Rockies.

Clipper system for Wednesday will move across South Dakota and
eastern Nebraska which will increase winds over areas east of the
Laramie Range beginning tonight and much of Wednesday. GFS 850mb
winds over the Panhandle increase to 30-35kts this evening and up
to 40-45kts during the day Wednesday. Will likely experience
strong wind similar to yesterday for the Panhandle Wednesday with
wind gusts of 40-45MPH. Yet another clipper system for Thursday
with another windy days for areas east of the Laramie Range.

.LONG TERM...(Thursday night through Monday)
Issued at 300 AM MST Tue Dec 12 2017

Thursday night/Friday...Mostly clear Thursday night with
temperatures above normal due to decent mixing and surface winds.
Flow aloft backs on Friday to northwest with a surface lee trough
forming, helping to boost maximum temperatures into the 40s west of
I-25, and 50s east of I-25.

Saturday...Cooler and wetter as a shortwave trough aloft and its
associated cold front sweep eastward across our counties. Chances
for snow showers, and some rain showers, will increase after
midnight Friday night, and peak during the daylight hours on
Saturday, especially west of Interstate 25.

Sunday...Similar temperatures to Saturday in the wake of the
shortwave trough aloft and cold front, though it will be drier with
north flow aloft. Breezy to windy per progged surface through 700 mb

Monday...Quite windy and a bit warmer as the flow aloft backs to
northwest and strengthens significantly. Although there will be
scattered to broken middle and high clouds in the moist flow aloft,
no precipitation is expected due to relatively dry low levels and
downslope low level winds.


.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 420 AM MST Tue Dec 12 2017

VFR. Wind gusts to 30 knots...mainly before 00Z.


Issued at 300 AM MST Tue Dec 12 2017

Sunny and dry today across southeast Wyoming and Nebraska
Panhandle. Less wind expected today over what we have been
experiencing the past several days in the Panhandle. That will
change Wednesday as another Clipper system tracks across South
Dakota and eastern Nebraska. Northwest winds in the Panhandle and
east of the Laramie Range expected to increase later tonight and
through much of Wednesday. Timing of the Clipper system should
allow colder air to move into the area and keep afternoon humidity
above critical levels, so critical fire weather conditions are not




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