Area Forecast Discussion
Issued by NWS Rapid City, SD

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000
FXUS63 KUNR 261654
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
954 AM MST Sun Feb 26 2017

.SHORT TERM...(Today Through Monday Night)
Issued at 339 AM MST Sun Feb 26 2017

Upper level analysis has shortwave trof shifting into Minnesota
with weak ridging expanding across the western Dakotas. Another
closed low is sinking south along the Pacific coast. Across the
Northern Plains, skies are mainly clear with the exception of some
cloudiness across North Dakota. At the surface, high pressure
resides across North Dakota with weak low pressure across central
Montana. Light westerly boundary layer flow is present across the
forecast area, with 3am temperatures mainly in the teens.

Today...Weak upper ridging and low-level west-southwesterly flow
will bring drier and slightly warmer weather to the area. Weak
area of low pressure will track from Montana through North Dakota
today, bringing some breezy westerly winds to northwestern South
Dakota. Skies will be mostly sunny, and highs will be generally
in the 30s, with some lower 40s across the central SD plains.

Clouds will be on the increase tonight with lows falling into the
teens.

Monday...Weak ridging shifts east as trof develops across the
Pacific Northwest. Cloud cover will increase from west to east on
Monday, with mostly cloudy skies expected across the entire
forecast area by afternoon. Weak surface trof moves across
Northeast WY and western SD by the afternoon with southerly winds
ahead of it, and winds turning northwest behind it. Temperatures
will remain slightly below average, in the 30s to around 40
degrees.

By Monday night, weak shortwave energy will cross the Northern
Plains, bringing a chance of light snow to the area. Best chances
will be across Northwest SD after midnight. Low temperatures will
be in the teens to lower 20s.

.LONG TERM...(Tuesday Through Saturday)
Issued at 339 AM MST Sun Feb 26 2017

Weak upper shortwave will exit the area Tuesday morning, with only
a few lingering snow showers expected across northwest SD. Cool
and mainly dry northwest flow will persist through Thursday with
ridging expected for Friday into the weekend. Temperatures will
remain slightly below average through Thursday, with a warm up
expected for Friday, Saturday and Sunday.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Monday)
Issued At 953 AM MST Sun Feb 26 2017

VFR conditions will prevail through Monday morning. Some
gusty low-level winds will be possible across northeastern WY
tonight.

&&

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

$$

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


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