Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 290524

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1124 PM MDT Tue Mar 28 2017

.SHORT TERM...(This Evening Through Wednesday Night)
Issued at 133 PM MDT Tue Mar 28 2017

Latest analysis showed the upper low located over New Mexico this
afternoon with abundant moisture streaming northward into the
forecast area along the east side of the upper trough. The
northwestern edge of the region of widespread rain over parts of
northeastern Wyoming and much of western South Dakota continues to
move slowly northward this afternoon as the moisture encounters a
band of drier air over northwestern SD and much of northeastern
WY. Another NE-SW band of showers is currently developing in an
area of strengthening mid-level frontogenesis over parts of far
northwestern SD into northeastern WY. Expect showers there to
increase in coverage during the rest of the aftn into this
evening. Temperatures may cool enough this evening for some light
snow to develop over the higher elevations of the Black Hills. Any
snow accumulations there tonight would be light, generally an
inch or two, with locally higher amounts possible on the highest
peaks overnight. The precipitation will gradually end from north
west to southeast tonight as the upper trough shifts the southerly
flow of moisture to the east of the forecast area. Low
temperatures tonight will generally be in the upper 20s to the
upper 30s.

Mainly dry and warmer weather is expected on Wednesday with
decreasing clouds and highs on the plains generally in the 50s.
Dry weather will continue on Wednesday night with lows in the
upper 20s to upper 30s by Thursday morning.

.LONG TERM...(Thursday Through Tuesday)
Issued at 133 PM MDT Tue Mar 28 2017

A transient upper ridge on Thursday will be followed by another
splitting upper trough creating good chances of rain from Thursday
night into early Saturday. Light snow may occur over the higher
elevations during the nights. Mainly dry weather is expected
during the rest of the weekend, but a few showers will still be
possible given weakly unstable flow.


.AVIATION...(For the 06Z TAFS Through 06Z Wednesday Night)
Issued At 1121 PM MDT Tue Mar 28 2017

Widespread MVFR/IFR ceilings will continue through the night
across portions of northeast Wyoming and western South Dakota.
Local LIFR conditions expected in the vicinity of the Black Hills.
Some areas of fog will develop overnight with IFR/LIFR
visibility. Conditions will improve Wednesday morning, with VFR
conditions Wednesday afternoon and evening.




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