Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 150940
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
240 AM MST Thu Feb 15 2018

.SHORT TERM...(Today through Saturday)
Issued at 240 AM MST Thu Feb 15 2018

Nice band of snow over far se Wy early this morning diminishing
now with warming cloud tops evident on satellite. Snow will
continue to fall over the higher mtns today as moist winds are
lifted up the facing slopes. So far about 4-6 inches noted on
SNOTELS and should get another 4-8 inches today. Otherwise a cold
front will drop south across the CWA with temperatures falling
behind it later this morning and afternoon. Some post-frontal snow
showers expected behind the front this afternoon into this
evening, aided by an upper impulse that will move by later today
into this evening. Skies will clear overnight allowing for mins to
fall into the single digits over many areas. Just a quick visit of
the cold air as return flow returns Friday and max temps rebound
into the mid 30s to mid 40s. Not as cold Friday night with max
temps a little warmer Saturday but attention will turn to
increasing winds late Friday with 7H winds exceeding 60kts over
the Laramie Range, varying during the day Saturday. Likely will
need some wind hilites for the wind prone areas later Friday
onward but will let current hilites expire before issuing.

.LONG TERM...(Saturday night through Wednesday)
Issued at 240 AM MST Thu Feb 15 2018

Strong winds should be easing Saturday night into Sunday morning.
Craig to Casper 850/700mb height gradients still in the mid 60
meter range Saturday night with 700mb winds up around 60kts, so
wind prone areas still should be blowing hard.

Guidance very consistent on next cold front entering area from the
northwest Sunday afternoon/evening. Expect snow to start up by
Douglas by Sunday mid afternoon and then spread south through the
evening hours. This is looking like a widespread heavy snow event
with Converse County possibly seeing a foot of snow and Cheyenne
maybe seeing 3-5 inches. We will need to start getting the word
out on this event and will post something on social media about it
this morning.

Very cold behind the front for Monday and Tuesday as 700mb
temperatures fall to -18 to -20C. Single digit highs for Monday
with lows well below zero for most areas Monday night. These cold
temperatures look to stay with us through at least Wednesday
before westerly winds return to start warming up temperatures
Thursday.

&&

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

VFR conditions should prevail across most of the area, especially
the eastern plains, into Thursday morning before a cold front moves
southward. IFR conditions are expected at KCDR Thursday afternoon in
light to moderate snow. Otherwise, MVFR CIGS and occasional VIS
below 3 miles are expected at KRWL tonight along with KLAR by
sunrise. Do not expect the snow to be persistent with only periods
of MVFR conditions over the next 10 hours.

&&

.FIRE WEATHER...
Issued at 240 AM MST Thu Feb 15 2018

No fire weather concerns seen through the weekend with cool to
mild temperatures. Colder across the area today into Friday
morning then warmer temperatures return for the weekend, along
with some strong winds around the mountains as well.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Winter Storm Warning until 6 PM MST this evening for WYZ112-114.

     Winter Weather Advisory until 8 AM MST this morning for WYZ110-
     113-115>117.

NE...None.
&&

$$

SHORT TERM...RE
LONG TERM...GCC
AVIATION...TJT
FIRE WEATHER...RE



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