Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 271106
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
406 AM MST Mon Feb 27 2017

.SHORT TERM...(Today Through Tuesday Night)
Issued at 332 AM MST Mon Feb 27 2017

Upper level analysis has near zonal flow across the CONUS with
upper trof moving into the Northern Rockies. Skies are mostly
cloudy across the Northern Plains with some light echoes across
Northwest SD early this morning. At the surface, weak frontal
boundary is draped east west across central SD with only slightly
higher dewpoints and east to northeast winds to the north of the
boundary. Temperatures at 3am are mainly in the teens to lower
20s.

Today...Warmer air will advect into the region ahead of the next
shortwave that moves in tonight. Temperatures will rise into the
30s and 40s, but snowpack will slow warming across southern
portions of the area. Clouds will increase today as the shortwave
approaches, and light snow will move into Northeast Wyoming and
the Black Hills late this afternoon and expand over the area
tonight. Light snow accumulations will be possible late tonight
across portions of northeastern WY and northwestern SD, with
some places receiving around 2 inches of snow. Low temperatures
will fall into the teens to lower 20s.

Tuesday...Upper level trof will slide across the Northern Plains
on Tuesday, with mostly cloudy skies expected. Weak shortwave
energy will keep a chance of snow in the forecast for much of the
day. Best chances will be from the Black Hills area into Northwest
South Dakota. High temperatures will be slightly cooler, in the
upper 20s to mid 30s. Light snow will linger into Tuesday evening
with the area finally clearing out late Tuesday night. Low
temperatures will fall into the teens to lower 20s.

.LONG TERM...(Wednesday Through Sunday)
Issued at 332 AM MST Mon Feb 27 2017

Cool and mainly dry northwest flow will develop over the area
Wednesday and Thursday as the upper trof finally shifts east.
Temperatures will remain slightly below average. The exception to
the dry weather will be Wednesday night, when a fast-moving
clipper will sweep through the Northern Plains, bringing a band
of snow to parts of the area. Upper ridging is then expected
Friday into the weekend, resulting in dry and warmer weather.

&&

.AVIATION...(For the 12Z TAFS Through 12Z Tuesday Morning)
Issued At 332 AM MST Mon Feb 27 2017

Mainly VFR conditions will prevail through midday. MVFR
conditions will develop in light snow across northeastern WY and
the Black Hills area late this afternoon, with light snow and IFR
conditions developing overnight across much of the area. These
conditions will persist into Tuesday morning.

&&

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

$$

SHORT TERM...15
LONG TERM...15
AVIATION...15


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