Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 212000

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
200 PM MDT Fri Apr 21 2017

.SHORT TERM...(This Evening Through Saturday Night)
Issued at 158 PM MDT Fri Apr 21 2017

High pressure sits over the Dakotas, with an upper trough
stretching from MT through CO. Satellite shows a broad band of
stratus along the trough, and cumulus developing over portions of
the northern plains. Most of the precip is to the south and west
of the CWA, but showers and isolated thunderstorms have developed
across southwestern SD and northeastern WY this afternoon. At the
surface, winds are southeasterly around 10-15 mph. Temperatures
are in the mid 40s to mid 50s.

Chances for rain showers (with isolated thunderstorms in the early
evening) will continue tonight across northeastern WY and
southwestern SD, and then gradually diminish overnight as the trough
slides south of the region. Lows tonight will be in the 30s.

An upper ridge will bring mild weather for the weekend. Other than
some lingering showers over northeastern WY Saturday morning and
possible showers over the Hills Saturday afternoon, conditions will
be dry until the next system moves in Sunday night. Highs will be in
the upper 50s to upper 60s Saturday, warming to the mid 60s to mid
70s Sunday. Upper flow will become southwesterly for the second half
of the weekend ahead of the approaching trough, and southwesterly
winds will become breezy across south central SD Sunday.

.LONG TERM...(Sunday Through Friday)
Issued at 158 PM MDT Fri Apr 21 2017

Unsettled weather returns Sunday night as a series of
waves begins to cross the region. Daily chances for showers are
expected in most areas. Colder air could bring some
overnight/morning snow to some areas depending on the timing of the
systems. At this point, models differ greatly on track and timing of
the waves. Near average temperatures are expected for Monday, with
below average highs in the 50s for the rest of the week.


.AVIATION...(For the 18Z TAFS Through 18Z Saturday)
Issued At 142 PM MDT Fri Apr 21 2017

Isolated Thunderstorms will occur over northeastern Wyoming, the
Black Hills and far southwestern South Dakota this afternoon into
early this evening. Scattered showers will occur over
northeastern Wyoming, the Black Hills and far southwestern South
Dakota tonight. Areas of MVFR cigs are expected near any showers
or thunderstorms.




SHORT TERM...Pojorlie
LONG TERM...Pojorlie
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