Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 100532

Area Forecast Discussion
National Weather Service Cheyenne WY
1032 PM MST Fri Mar 9 2018

.SHORT TERM...(This evening through Sunday Night)
Issued at 1242 PM MST Fri Mar 9 2018

Tonight...Fast moving shortwave trough aloft moves east southeast
into eastern Montana and northeastern Wyoming by dawn with its
associated cold front entering our northern counties after midnight.
Not a lot of moisture associated with the system, however, looks
like enough to produce numerous snow showers over our Snowy and
Sierra Madre Ranges after midnight, with a slight chance of snow
showers over our far northern counties. Another relatively mild
night with decent mixing and increasing cloud cover.

Saturday...The progressive shortwave trough aloft moves quickly
southeast to central Nebraska by late afternoon with its associated
cold front quickly sweeping across our counties, producing blustery
northwest winds due to rapid pressure rises and decent surface
pressure gradient. Scattered to numerous snow showers in the morning
north of a Laramie to Alliance line, otherwise dry. Drying out in
the afternoon in the wake of the upper trough axis. Considerably
colder with 700 mb temperatures falling to -10 Celsius.

Saturday night...Mostly clear and colder in the wake of the cold
frontal passage and with lessening winds.

Sunday...Weak northerly flow aloft prevails with a dominant surface
high over western North Dakota keeping cool north winds over our
counties and limiting maximum temperatures to the 40s.

.LONG TERM...(Monday through Friday)
Issued at 1242 PM MST Fri Mar 9 2018

Monday...Warming trend develops under weak ridging aloft. Continued
dry with lack of low and mid level moisture.

Tuesday...Dry with a warming trend as the ridge axis aloft moves
over western Wyoming with minimal winds at the surface due to the
minimal low and mid level gradients.

Wednesday/Thursday...Dry and mild with the ridge aloft moving off to
our east and southwest flow aloft developing. Maximum temperatures
soaring into the upper 50s and 60s, with even some lower 70s for
Thursday east of Interstate 25.

Friday...Cooler with increasing cloud cover as a trough aloft moves
into Utah producing diffluent south winds aloft over our
counties. Scattered showers look like a decent bet in the
afternoon with the abundance of low and mid level moisture and
dynamics with the vigorous trough aloft.


.AVIATION...(For the 06Z TAFS through Saturday evening)

VFR conditions will prevail tonight, with a chance of MVFR CIGS at
KRWL and KLAR as a cold front moves across the area. Otherwise, CIGS
will remain above 5000 feet AGL further east towards western
Nebraska and KCYS. West winds will stay elevated tonight from KRWL
to KCYS as the front moves into the area, with gusts between . 25 to
35 knots possible. Winds will shift into north or northwest by early
Saturday morning.


Issued at 1242 PM MST Fri Mar 9 2018

Low afternoon humidities expected Sunday, Monday, Wednesday and
Thursday, though fortunately winds looks to be relatively light
those days.




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