Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 141130

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
530 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 12Z TAFS Through 12Z Sunday Morning)
Issued At 528 AM MDT Sat Oct 14 2017

ISOLD-SCT TS will be possible on the SD plains this morning. A
cold front will move through the area, bringing gusty northwest
winds along with areas MVFR CIGS in -shra that will last through
the day today, clearing NW-SE. Local IFR conds will be possible
over parts of Northeast WY and the northern Black Hills into mid
afternoon. VFR conds expected all places by late in the period.


SD...Wind Advisory until 5 PM MDT this afternoon for SDZ026-030-031-



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