Area Forecast Discussion
Issued by NWS Rapid City, SD

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981
FXUS63 KUNR 141723
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1123 AM MDT Sat Oct 14 2017

.DISCUSSION...(Today Through Friday)
Issued at 217 AM MDT Sat Oct 14 2017

Positively-tilted upper trough is pushing into the
Rockies, and satellite is showing an increase of clouds across the
region. A few weak showers/storms continue to move across portions
of the western SD plains. An inverted surface trough stretches over
the northern plains, while the cold front crosses the CWA.
Temperatures are in the upper 30s to 40s.

Precipitation and gusty winds are expected today as the trough
quickly moves through the region. Showers (and a few isolated
thunderstorms) will expand across the CWA today, mainly along the
area of enhanced frontogenesis stretching from southwestern SD into
central SD and eastward. Precip will be mainly in the form of rain,
but some light snow showers will be possible across northeastern WY
and the Black Hills, with minimal accumulations. Pressure rises
around 4 mb/3hr and CAA will enhance northwesterly winds, especially
just east of the Black Hills, where winds of 25-35 mph and gusts
near 40 mph are expected. Have issued a Wind Advisory for that area
this morning through the afternoon. Precip and winds will diminish
this evening. Highs today will be in the 40s, with 30s for the Black
Hills. Lows tonight will be around 30.

Behind this trough, broad upper ridging will build over the western
and central CONUS, and then transition into zonal flow midweek. Dry
weather and above average temperatures are expected for next week.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Sunday)
Issued At 1121 AM MDT Sat Oct 14 2017

Showers will move east this afternoon, exiting the area early this
evening. Some snow will occur over the higher elevations. Isolated
thunderstorms will wind down over central SD early this afternoon.
Gusty northwest winds are expected through 00z. Areas MVFR CIGS
expected this afternoon with local IFR conditions with heaviest
precipitation. VFR conditions will overspread the area tonight.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Wind Advisory until 5 PM MDT this afternoon for SDZ026-030-031-
     072>074.

WY...None.
&&

$$

DISCUSSION...Pojorlie
AVIATION...Helgeson



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