Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 131714

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1114 AM MDT Fri Oct 13 2017

.DISCUSSION...(Today Through Thursday)
Issued at 153 AM MDT Fri Oct 13 2017

Broad upper trough covers much of the western CONUS,
with ridging over the east. A 120-kt jet is moving over the northern
plains through southwest flow, beneath which a line of scattered
showers has developed, stretching from northeastern SD into
northwestern NE. At the surface, high pressure rests over the
northern plains. Winds are light and variable, and temperatures are
dipping into the 30s, with some 20s in the Hills.

Showers will diminish early this morning, and southerly winds will
become breezy on the backside of the exiting surface high. Under
mostly sunny skies, highs will be in the upper 50s to mid 60s.

The upper trough will dig into the Rockies tonight, and a cold front
will begin crossing the region. Chances for rain/snow showers will
increase early Saturday morning and continue into the afternoon, but
dry weather is expected by the evening as the trough quickly moves
through the northern plains. The northern Hills could see a little
upslope-enhanced snow, but accumulations are expected to be minimal.
Gusty northwest winds are also expected Saturday afternoon. Pressure
rises of 3-4 mb/3hr and continued CAA could result in speeds near
advisory criteria. Highs Saturday will be mainly in the 40s.

Upper ridging then builds over the western CONUS, resulting in dry
and mild weather Sunday into next week.


.AVIATION...(For the 18Z TAFS Through 18Z Saturday)
Issued At 1113 AM MDT Fri Oct 13 2017

VFR conditions expected through this evening with gusty southerly
winds on the open plains at times. A cold front will move through
late tonight into Saturday morning bringing gusty northwest winds
along with areas MVFR CIGS.




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