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Area forecast discussion for western South Dakota and northeastern Wyoming
National Weather Service Rapid City South Dakota
216 PM MST sun Feb 26 2017

Short term...(this evening through Monday night)
issued at 213 PM MST sun Feb 26 2017

Weak upper ridging is shifting over The Rockies and into the
northern plains, while an upper low spins off the Pacific
northwest. Mostly clear skies this morning have become
increasingly cloudy this afternoon. Radar is showing some weak
echoes across portions of western SD, but obs and webcams have not
indicated anything reaching the ground. Low levels are pretty
dry, but have added some low pops for the afternoon, especially
near the ND border. With a surface low over southwestern ND, winds
across the County Warning Area are generally 10-20 kts from the west, with some
stronger gusts across northwestern South Dakota. Temperatures range from the
mid 20s across snowier areas to the 30s and lower 40s.

Upper flow will become zonal tonight as upper low moves inland.
Under mostly cloudy skies, lows will be in the teens. Some breezy
southwest winds will be possible across parts of northeastern Wyoming and
southwestern/south central South Dakota.

Warmer air will advect into the region ahead of the next shortwave
on Monday. Temperatures will rise into the 30s and 40s, but snowpack
will slow warming across southern portions of the area. Clouds will
increase Monday as the wave moves in, and snow will expand over
portions of the area Monday night. Light snow accumulations will
be possible across far northeastern Wyoming and northwestern SD, with
some places receiving around 2 inches of snow.

Long term...(tuesday through sunday)
issued at 213 PM MST sun Feb 26 2017

Upper shortwave will exit the area Tuesday morning, with some
lingering snow across northwestern South Dakota. Cool and mainly dry
northwest flow will persist through Thursday, with highs 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 00z tafs through 00z Monday evening)
issued at 213 PM MST sun Feb 26 2017

Mainly VFR conditions will prevail through Monday morning. Some
MVFR conditions will be possible in light showers across
northwestern South Dakota. Gusty low-level winds will be possible across
northeastern Wyoming tonight.


Unr watches/warnings/advisories...
South Dakota...none.

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