FXUS65 KCYS 172122

Area Forecast Discussion
National Weather Service Cheyenne WY
222 PM MST Sat Nov 17 2018

.SHORT TERM...(This evening through Sunday)
Issued at 141 PM MST Sat Nov 17 2018

Not much change is expected over the next couple hours as winter
precip continues across southeastern Wyoming and western
Nebraska. The transition to all snow was slow to take place over
southern laramie county but has finally kicked over to light snow.
The best area of snowfall continues to be underneath and
immediately adjacent to the east west band across southern Platte,
Goshen and Northern Laramie counties. This band has shown high
ZDR indicative of enhanced snowfall rates. This will likely
continue as the band pushes further east into the Nebraska

Snow should begin to die down tonight as the main brunt of the
upper level forcing drifts to the southeast and dry westerly down
slope winds develop. Very cold temperatures are expected tonight
with a wide spread snowpack in place. Low teens to single digits
are likely with wind chills 10 below or more.

Expect somewhat of a rebound tomorrow as highs in the lower to
middle 30s develop in the afternoon. Snowpacked areas may see
temps a few degrees cooler. Weather should be mostly clear Sunday
afternoon as high pressure builds in behind the departing winter

.LONG TERM...(Sunday night through Saturday)
Issued at 141 PM MST Sat Nov 17 2018

Not much different in the long term period either. Monday night
will be frigid again with single digit temperatures for most.
Windchills will dip to below zero. High pressure will keep things
quiet for the coming days with temperatures slowly rebounding.
A quick moving shortwave will undercut the ridge Wednesday which
could bring a few showers to far southern Wyoming. Most of the
area should stay dry through Thursday.

An approaching trough Thursday and Friday will bring another
chance for precipitation to the area. This should continue through
the weekend as an area of low pressure develops in the lee of the
rockies. Not much more to be gleaned from this system as model
difference are still a little to large for more detail. Expect a
wet and cold period to continue through next week.


.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1128 AM MST Sat Nov 17 2018

Poor flying conditions ongoing across much of the region as light
to moderate snow with IFR conditions are ongoing with the
exception of Rawlins where VFR conditions currently exist. Icing
and areas of turbulence are also ongoing aviation impacts for many

Light snow, low ceilings, and reduced visibility will persist
through much of the afternoon until 00-03Z when snow decreases and
shifts east. Conditions will improve briefly but then fall with
all the low-level moisture as IFR ceilings likely return
overnight and into Sunday morning. VFR conditions are finally
expected late morning Sunday after 16Z.


Issued at 141 PM MST Sat Nov 17 2018

A low pressure system will produce widespread moderate
to heavy snow across most of southeast Wyoming and the western
Nebraska Panhandle today. The snow will end from north to south
this evening. Colder temperatures through Sunday with snowpack and
non-critical humidities and winds will preclude fire weather
concerns. Much of next week will be dry with milder temperatures.


WY...Winter Weather Advisory until 8 PM MST this evening for WYZ101-

Winter Storm Warning until 8 PM MST this evening for WYZ103>108-

NE...Winter Weather Advisory until 8 PM MST this evening for NEZ002-

Winter Storm Warning until 8 PM MST this evening for NEZ019-020.



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