Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 232016
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
116 PM MST Thu Nov 23 2017

.DISCUSSION...(This Evening Through Thursday)
Issued at 115 PM MST Thu Nov 23 2017

Current surface map shows warm front pushing into the eastern
Dakotas. Temperatures in the 60s to mid 70s this afternoon, with
several record highs set. For tonight, upper trof crosses
southern Canada with cold front sliding through the northern
plains. 3-5mb/3hr pressure rises with 30-40kt boundary layer winds
will bring a period of stronger winds late tonight into early
Friday afternoon. Have issued a wind advisory for the plains of
northwest/west central South Dakota.  May be a few rain/snow showers
with the frontal passage...with best chance in upslope flow of
northern Black Hills.

Surface high builds across the area Friday night into
Saturday. Building upper level ridge on Sunday with another
surge of warm temperatures. 850mb temperatures similar today with
westerly downslope flow. Near record highs possible Sunday with
temperatures near 70 on the plains east of the Black Hills.

Splitting upper level trof crosses the Rockies Monday with cold
front slicing through the forecast area. Timing of front will
impact highs...with near record highs possible ahead of the front.
Best forcing with upper trof remains north and south of the
forecast area...a few showers possible with the frontal passage.
Dry weather and near normal temperatures expected for the last
half of next week.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Friday)
Issued At 1029 AM MST Thu Nov 23 2017

VFR conditions will prevail through the forecast period. A strong
cold front will move through the region early Friday morning, with
northwest winds gusting to 35-45 knots. The front will arrive in
the KGCC area around 4AM, and in the KRAP area around 5AM. Winds
will persist through early afternoon, then slowly diminish through
the remainder of the day.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Wind Advisory from 4 AM to 3 PM MST Friday for SDZ001-002-
     012>014-026-031-032-072-073.

WY...None.
&&

$$

DISCUSSION...7
AVIATION...15



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