Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 232141

Area Forecast Discussion
National Weather Service Cheyenne WY
241 PM MST Mon Jan 23 2017

.SHORT TERM...(This evening through Tuesday night)
Issued at 245 PM MST Mon Jan 23 2017

Tonight...As the upper low moves to north central Colorado, snow
will become widespread over our northern and western counties with a
deeply saturated airmass and plenty of upward vertical motion
progged. Snow will quickly spread from west to east overnight
especially over our northern counties. Our far southeast Wyoming
counties and southern Nebraska panhandle will be in a low level
downsloping situation which will limit the areal coverage of snow.

In coordination with our neighboring offices, we will upgrade to
winter storm warnings for Niobrara county and for the northern half
of the Nebraska panhandle, with winter weather advisories for
locations from Rawlins to Douglas to Torrington to Scottsbluff and
Bridgeport. Although snowfall amounts may be less than criteria,
impacts may be greater due to expected gusty winds producing areas
of blowing snow and reduced visibilities.

Tuesday...Fortunately, the progressive upper low will move eastward
to eastern Nebraska by late afternoon with decent upward vertical
motion across our northern counties, and lesser so further to the
south. Behind the system, low level north winds will crank up and
produce areas of blowing snow and near zero visibility at times.
With the lift waning somewhat, the late morning expiration of our
lower elevation winter weather advisories looks good for the lower
elevations west of the Laramie Valley.

Tuesday night...As the upper low moves even further to the east,
lift will wane with snow decreasing in coverage across Wyoming and
especially so in western Nebraska after midnight. We will thus end
the Wyoming hilites around 6 pm Tuesday with western Nebraska
hilites ending around midnight Tuesday night.

.LONG TERM...(Wednesday through Monday)
Issued at 245 PM MST Mon Jan 23 2017

A generally cool and mainly dry weather pattern expected over the
cWA during the period with a north to northwesterly upper flow
across the area. Favorable orographics and some weak impulses
should keep snow showers going at times over the higher mtns
through Thursday night before moisture decreases with Friday
through the weekend looking dry. A cool surface high will hold
over the Rocky mtns/northwest CONUS through Friday keeping
temperatures on the chilly side across the CWA before moderating
some over the weekend...closer to average. Also looking rather
breezy for much of the period though high winds not expected.


.AVIATION...(For the 18Z TAFS through 18Z Tuesday morning)
Issued at 1030 AM MST Mon Jan 23 2017

Sctd snow showers will affect the KLAR and KRWL vcty this
afternoon with associated MVFR/IFR cigs and vsbys. VFR elsewhere
with increasing clouds across the plains. Conditions expected to
lower to MVFR/IFR areawide tonight with light snow becoming more
widespread and continuing into Tuesday morning.


Issued at 245 PM MST Mon Jan 23 2017

No concerns due to widespread snowfall event and
expected humidities.


WY...Winter Weather Advisory from midnight tonight to 6 PM MST
     Tuesday for WYZ101-107-108-116.

     Winter Weather Advisory until 11 AM MST Tuesday for WYZ103>105-

     Winter Storm Warning from midnight tonight to 6 PM MST Tuesday
     for WYZ102.

     Winter Weather Advisory until 6 PM MST Tuesday for WYZ112-114.

NE...Winter Storm Warning from midnight tonight to midnight MST
     Tuesday night for NEZ002-003-095-096.

     Winter Weather Advisory from midnight tonight to midnight MST
     Tuesday night for NEZ019>021.



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