Area Forecast Discussion
Issued by NWS Rapid City, SD

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000
FXUS63 KUNR 142320
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
420 PM MST Thu Dec 14 2017

.DISCUSSION...(This Evening Through Thursday)
Issued at 200 PM MST Thu Dec 14 2017

Upper level analysis has weak shortwave sliding through the
Dakotas now, with the main trof across the eastern CONUS and a
sharp ridge to the west. Skies are mostly cloudy across the area
with some light snow showers diminishing and moving south.
Temperatures at 2pm are mainly in the 30s, and winds are breezy
out of the northwest.

Snow showers and breezy northwest winds will continue to diminish
this afternoon, coming to an end by early evening. Mostly cloudy
skies will give way to partly cloudy skies tonight as weak high
pressure moves into the area.

Upper level ridge to the west will shift over the central states
on Friday, as a trof pushes into the western CONUS. Temperatures
will warm into the 50s. Under partly cloudy skies, westerly winds
will be around 10 to 20 mph.

The next upper trof will begin crossing the Rockies Friday night
into Saturday, and chances for precip will increase. Light snow
will spread over mainly western portions of the CWA Saturday
through Saturday night, with accumulations around an inch or
two. Colder air will also accompany this trof. Highs both days
will be in the 30s to lower 40s, with lows in the teens and 20s.

Mild and mostly dry weather is expected for the beginning of next
week, as an upper ridge moves over the region. Both the GFS and
ECMWF are showing a trof digging into the western CONUS towards
the end of next week, which could bring much colder weather to the
area for next weekend.

&&

.AVIATION...(For the 00Z TAFS Through 00Z Friday Evening)
Issued At 419 PM MST Thu Dec 14 2017

Leftover MVFR CIGS over the Black Hills and across far southern SD
will dissipate this evening. Mid/high clouds will invade later
tonight into Friday with VFR conditions expected.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...15
AVIATION...Helgeson


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