Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 192343

Area Forecast Discussion
National Weather Service Cheyenne WY
543 PM MDT Mon Mar 19 2018

.SHORT TERM...(This evening through Tuesday)
Issued at 158 PM MDT Mon Mar 19 2018

Latest visible satellite loop was showing the back edge of low
clouds extending from near Lusk southeast to Scottsbluff to areas
between Kimball and Sidney. These clouds should continue to shift
east this evening with Chadron being the last place to clear out.
Snow showers have been developing behind this deck of low clouds
across southeast Wyoming, due to some residual boundary layer
moisture and instability. Would not be surprised to see the
visibility drop below 1/2 mile in a few of these snow showers late
this afternoon until sunset. Not expecting much in the way of
snow accumulation this afternoon, due to warm road temperatures.
However, if we see some snow showers closer to sunset, then
roadways could become slick in a few spots. Another concern
tonight is the potential for low clouds to backbuild into the
northern Nebraska panhandle and produce some fog. We decided to
keep the patchy fog in the grids for now and let the evening shift
keep an eye on that potential.

A mostly sunny and milder day is in store for the area Tuesday,
Although, it will become more breezy as downslope develops, in
response to the upper level ridge building over the area.

.LONG TERM...(Tuesday night through Monday)
Issued at 158 PM MDT Mon Mar 19 2018

The upper level ridge will continue to dominate the area through
Thursday which will bring on mild temperatures and breezy
conditions. This pattern will favor high temperatures in the 50s
and 60s on Wednesday with even 60s and 70s on Thursday. Wind
speeds over the wind corridors may range from 20 to 35 mph with
some gusts to 40 mph at times. Things become a little more
unsettled Thursday-Saturday as an upper level trof moves in the
Pacific northwest moves east towards the Dakotas on Saturday. This
may favor more significant snowfall for the mountains, but not so
much for the Wyoming and Nebraska Plains. However, one cannot
rule out some light precipitation during this period with perhaps
a few thunderstorms in northern Wyoming.


.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 539 PM MDT Mon Mar 19 2018

Radar showing band of snowshowers north of Cheyenne to Wheatland
this afternoon, moving southeast at 20 MPH. Those flying low can
expect visibility down to 1/2 mile in this band. This band
expected to dissipate after sunset as it moves into the southern
Nebraska Panhandle. IFR conditions at KCDR and KAIA overnight as
northeast upslope winds continue. SOutheast WYoming airports
should be mainly VFR through next 24 hours.


Issued at 158 PM MDT Mon Mar 19 2018

Gusty wind speeds are anticipated in Wyoming and Nebraska tomorrow,
but afternoon humidities will generally be above 30 percent.
Therefore, we are not anticipating any elevated fire weather
conditions. Drier conditions are anticipated over the Nebraska
panhandle on Wednesday and Thursday with afternoon humidities
dropping to 20 to 25 percent except for the northern panhandle.
Wind speeds will only be 10 to 15 mph due to the influence of the
upper level ridge.




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