Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 231135
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
535 AM MDT Tue Oct 23 2018

.SHORT TERM...(Today through Wednesday night)
Issued at 245 AM MDT Tue Oct 23 2018

Overnight water vapor loop showed a negatively-tilted upper trough
lifting northward across northeast NV/northern UT accompanied by
scattered showers and a few tstorms extending across southern
WY/northwest CO. Outside the convection, skies were partly cloudy.
Light winds prevailed with temperatures in the 30s to low 40s.
With temp/dew point spreads below 3 degrees from the I-80 Summit
to Cheyenne, will need to keep an eye on patchy fog formation
toward daybreak.

Shortwave trough to the west tracks across eastern ID/western WY
today. Diffluent flow aloft and SBCAPEs near 500 j/kg along/west
of the Laramie Range may lead to isolated tstorm development this
afternoon. Shower coverage increases tonight and Wednesday morning
across the NE Panhandle in region of better upper lift and stronger
southerly low level jet. Showers shift east into west central NE
Wednesday afternoon. High temperatures today will range from the
mid 50s to mid 60s, and in the 60s Wednesday.

.LONG TERM...(Thursday through Monday)
Issued at 245 AM MDT Tue Oct 23 2018

Upper ridge axis from British Columbia through northern CA will
gradually translate eastward into the Intermountain West this
weekend. A strengthening northwest flow aloft will prevail with
periodic gusty winds, mainly during the daytime hours. Also, a
series of weak upper level shortwaves will track southeast across
northeast WY and far northwest NE Thursday night through Saturday
night triggering isolated showers. Above seasonal normal temperatures
will continue late this week with highs mainly in the 60s. A weak
front will bring slight cooling this weekend, followed by a warmup
Monday.

&&

.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 533 AM MDT Tue Oct 23 2018

VFR conditions are holding across the area early this morning.
MVFR to IFR will be possible through 15z as areas of fog and
light rain could develop. Celings will continue to drop through
the day ahead of an approaching upper level trough. Rain showers
will develop in the afternoon and continue overnight into
Wednesday where more widespread MVFR to IFR conditions are
expected at area terminals.

&&

.FIRE WEATHER...
Issued at 215 AM MDT Tue Oct 23 2018

Fire weather concerns will be minimal through mid-week due to
non-critical humidities and winds as well as chances for light
wetting precipitation. Mild daytime temperatures will continue
into the end of the week before slight cooling this weekend.
Periodic gusty winds will develop Friday through Sunday,
especially across southeast Wyoming.

&&

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

$$

SHORT TERM...MAJ
LONG TERM...MAJ
AVIATION...AL
FIRE WEATHER...MAJ


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