Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 192337

Area Forecast Discussion
National Weather Service Cheyenne WY
437 PM MST Mon Feb 19 2018

.SHORT TERM...(This evening through Tuesday night)
Issued at 235 PM MST Mon Feb 19 2018

Current forecast looking pretty much on track with some bands of
heavier snow now over western parts of the CWA working northeast.
Should see a period of heavier snow spread east across much of the
rest of the CWA this evening bringing a general 2-4 inches of
additional snowfall. Snow should taper off later tonight as
better energy and forcing shifts east of the area. Will keep
current hilites in place and defer to evening shift for any
changes. Very cold across the CWA tonight with mins in the single
digits below zero over much of the area. Winds light but still
cold produce some wind chills around -20 in some areas.

Mainly dry across the CWA Tuesday and Tuesday night outside of
some mtn snow showers. Main story will be cold temperatures
holding across the area as an arctic high settles down the high
plains. Max temps Tuesday only in the teens across much of the
CWA. Fortunately winds will remain rather light. Very cold again
Tuesday night with below zero temps once again.

.LONG TERM...(Wednesday through Monday)
Issued at 235 PM MST Mon Feb 19 2018

Some moderation of temperatures expected Weds and Thursday but
still chilly as the upper flow turns southwesterly and the cold
arctic high slips east away from the CWA. Snow showers will
continue to occur at times over the higher mtns in favorable swly
flow, aided by weak disturbances ejecting northeast ahead of an
upper trough over the western CONUS. GFS cuts off an upper low
over northern AZ Friday then moves it eastward to the southern
plains by late Saturday. EC maintains an open trough, moving it
across the area Friday night. In either case any pcpn should stay
confined to the mtns for the most part though some snow showers
possible over the plains Friday night if the EC pans out.
Otherwise a minor push of cooler air drops down the plains
Thursday night then warmer conditions should spread back over the
area over the weekend. Weak system Monday may bring some minor
cooling again.


.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 437 PM MST Mon Feb 19 2018

IFR to potential for periodic LIFR at all airports in SE Wyoming
and the western Nebraska Panhandle most of tonight with ceilings
and visibilities gradually lifting from west to east after 06Z as
the main axis of moisture and jet energy moves east. Expect MVFR
to VFR all sites after 14Z.


Issued at 235 PM MST Mon Feb 19 2018

No fire weather concerns anticipated through late this week with
cool to cold conditions and snow cover over many areas resulting
in non-critical conditions.


WY...Winter Storm Warning until midnight MST tonight for WYZ101>114-

     Winter Weather Advisory until 6 AM MST Tuesday for WYZ118-119.

     Winter Weather Advisory until midnight MST tonight for WYZ115.

NE...Winter Storm Warning until midnight MST tonight for NEZ002-003-

     Winter Weather Advisory until 6 AM MST Tuesday for NEZ019>021.



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