Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 210512

Area Forecast Discussion
National Weather Service Cheyenne WY
1012 PM MST Tue Feb 20 2018

Issued at 817 PM MST Tue Feb 20 2018

Latest surface analysis had shown that temperatures are already
well below zero in most of the Nebraska panhandle. The exception
is in Scottsbluff where they are in the single digits above zero.
Would expect temperatures to continue to tumble this evening and
overnight as another night of radiational cooling sets up over the
snow pack. It is certainly not going to take much wind to drop
wind chills below 20 below in the Nebraska panhandle. We are also
going to see these low wind chills in portions of southeast
Wyoming around Torrington and Wheatland where they saw a bit more
snow yesterday. We went ahead and added them and a few other zones
in SE WY where a combination of a bit stronger winds and deep snow
pack will create favorable conditions for low wind chills.


.SHORT TERM...(This evening through Wednesday night)
Issued at 230 PM MST Tue Feb 20 2018

Weak impulse will move east across the region this evening with
effect limited to some cloudiness as well as a few snow showers
over the higher mtns. Elsewhere mainly clear skies and light winds
along with now cover will allow for another very cold night with
mins below zero again. Wind chills look like they will get to or
below -20F over the northern CWA and the Laramie valley so have
posted a wind chill advy for those areas later tonight into Weds
morning. Quiet day again Weds and warmer but still on the cold
side. Will continue to undercut guidance temps given snow cover.
Not as cold Weds night as the cold arctic high over the plains
slips slowly east.

.LONG TERM...(Thursday through Tuesday)
Issued at 230 PM MST Tue Feb 20 2018

Looks like it will be cool and rather unsettled over the CWA
through the weekend as a couple system affect the region. A large
upper trough over the western CONUS Thursday will deepen some
through early Friday as additional energy digs in off the
northeastern Pacific. Disturbances ejecting northeast from this
system will bring widely sctd snow showers to the CWA both
Thursday and Friday. The main trough then moves by Friday night
with dry and cool weather for Saturday. The next shortwave scoots
across sat night into Sunday bringing some more snow showers,
primarily to the mtns. Dry and milder conditions return early
next week as the upper flow turns southwesterly ahead of the next
upper trough.


.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1006 PM MST Tue Feb 20 2018

A weak shortwave will transverse through the intermountain west
tonight into tomorrow. This shortwave may cause some mid level
clouds to stream from the southwest into the Wyoming TAF`s by
tomorrow evening. However, VFR conditions will still be the rule.


Issued at 230 PM MST Tue Feb 20 2018

No Fire weather concerns for the rest of the week with cool
temperatures and snow cover keeping conditions non-critical.


WY...Wind Chill Advisory until 9 AM MST Wednesday for WYZ101>105-107-

NE...Wind Chill Advisory until 9 AM MST Wednesday for NEZ002-003-



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