Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 240538
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
1138 PM MDT Fri Jun 23 2017

.SHORT TERM...(This evening through Sunday Night)
Issued at 200 PM MDT Fri Jun 23 2017

Tonight...Low clouds have been eroding from our southeast counties.
Northwest flow aloft continues but with lack of lifting mechanisms
and a fairly stable airmass, no showers or thunderstorms expected.
Low temperatures close to guidance minimums.

Saturday...Another relatively cool and stable day with lack of lift
precluding mention of showers and thunderstorms.

Saturday night...Slowly moderating airmass, thus low temperatures
near or a few degrees warmer than Friday night.

Sunday...Another dry day expected with low level stable airmass in
place and lack of lifting mechanisms. Airmass continues to slowly
moderate and took a compromise between the NAM and GFS guidance high
temperatures.

Sunday night...Airmass continues to slowly moderate with low
temperatures a few degrees warmer than Saturday night.

.LONG TERM...(Monday through Friday)
Issued at 200 PM MDT Fri Jun 23 2017

The eastern periphery of a large ridge of high pressure over the
Four Corners area extends east into our region Monday keeping a
rather quiet weather pattern going into the start of the new week.
By Tuesday the first in a series of shortwaves should start to
carve into the top of the ridge brining a modifying cold front
southeastward into eastern Wyoming. We bring in some 20 PoPs for
isolated afternoon showers and thunderstorms Tuesday across the
northeastern half of the area as well as across the Seminoe,
Ferris, and northern Laramie Range mountains. The boundary should
remain quasi-stationary through midweek keep isolated
afternoon/evening showers and thunderstorms going along and east
of the Laramie Range, then a stronger shortwave moves east across
the area Thursday into Friday when we advertise chance PoPs around
the Douglas area.

&&

.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
Issued at 1135 PM MDT Fri Jun 23 2017

VFR for most sites through the TAF period with generally light
winds and minimal to nil precipitation chances. One exception may
be in the immediate lee of the Laramie Range early this morning
where some MVFR ceilings are possible in a light, moist upslope
easterly flow as boundary layer temps cool and the inversion
lowers. Any lower stratus should lift by mid morning.

&&

.FIRE WEATHER...
Issued at 200 PM MDT Fri Jun 23 2017

Although afternoon humidities will be relatively low
west of Interstate 25, wind speeds will be relatively weak,
minimizing fire weather concerns.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&

$$

SHORT TERM.....RUBIN
LONG TERM......GARMON
AVIATION...DEL
FIRE WEATHER...RUBIN



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