Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 182317

Area Forecast Discussion
National Weather Service Cheyenne WY
517 PM MDT Sun Mar 18 2018

.SHORT TERM...(This afternoon through Monday night)
Issued at 230 PM MDT Sun Mar 18 2018

Current KCYS radar loop shows snow developing and spreading
across Albany and Carbon counties, west of I-25, this afternoon.
Visibilities have been as low as one half mile so far, and expect
this band of snow to become more widespread into late this
afternoon as it slowly move east into the I-25 corridor. Should
be a pretty good snow event for the Laramie Valley as winds have
already shifted into the north and are expected remain out of the
north or northwest through tonight. A few lightning strikes have
been detected just south of I-80, kept a slight chance of thunder
in the forecast through this evening. The rest of the forecast
looks on track through tonight, so made no additional changes to
Winter headlines, although will have to watch the foothills of the
southern Laramie Range and the northern Laramie Range. 12z models
show the position of the upper level low even further south
compared to yesterday, so expect even less impacts across
Converse/Niobrara counties as well as the southern Nebraska
panhandle as the storm redevelops over the southern plains. Expect
a general 1 to 3 inches of snow outside the Advisory/Warning
areas across the eastern plains of southeast Wyoming and western
Nebraska. Based on recent trends from the high res models, Some
places across the panhandle might not even get an inch of snow by
Monday morning.

Snow will come to an end from west to east after midnight tonight
through early Monday morning. A secondary disturbance aloft will
push across Wyoming on Monday, resulting in some afternoon snow
shower activity across southeast Wyoming. It will be cooler than
average Monday afternoon with highs only in the 30`s to maybe low
40`s across the lower valleys. There may be some patchy fog Monday
night as skies struggle to clear, but believe there will be enough
cloud cover to prevent fog development in most areas.

.LONG TERM...(Tuesday through Saturday)
Issued at 338 AM MDT Sun Mar 18 2018

With the exception of some lingering snow showers in the Sierra
Madre and Snowy Ranges Tuesday, the midweek timeframe looks fairly
quiet before our next chance of snow comes in Thursday across the
higher elevations of our western areas. We see an increased
chance of precipitation by the weekend as a series of shortwaves
moves through the fast west to southwesterly flow aloft.


.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 515 PM MDT Sun Mar 18 2018

Lowering conditions as northeast upslope wind flow continues this
evening across the Nebraska Panhandle into southeast Wyoming to
the Laramie Range. Area of snow seen along I-80 Corridor from
Cheyenne to Laramie will continue moving slowly east this evening
with snow eventually making it into the Panhandle after dark. Low
conditions/snow should continue through 12Z before winds shift and
conditions improve.


Issued at 155 PM MDT Sun Mar 18 2018

No Fire Weather concerns for at least the next few days with cool
temperatures and additional snowfall over much of the area. Drier
and warmer conditions are expected by the middle of the week.


WY...Winter Storm Warning until 6 AM MDT Monday for WYZ114.

     Winter Weather Advisory until 6 AM MDT Monday for WYZ110-112-115-



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