Area Forecast Discussion
Issued by NWS Rapid City, SD

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970
FXUS63 KUNR 082120
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
220 PM MST Fri Dec 8 2017

.DISCUSSION...(This Evening Through Friday)
Issued at 219 PM MST Fri Dec 8 2017

Strong upper ridging persists across the western CONUS with deep
upper trough across the eastern half of the country. Surface low
sits over northern MN with a strong pressure gradient continuing
across western SD. Winds across the area are generally northwest 20
to 30 mph with gusts to 40 mph. The exception is across the plains
just east of the Black Hills where winds obs show 25 to 40 mph with
gusts up to 55 mph. Winds will decrease over the next two hours as
the overnight inversion begins to set up. Upper ridging over the
next several days will move very little...resulting in not much
change in the weather pattern through much of next week. The
baroclinic zone will stay east of the area with temperatures
generally in the 40s to near 50. However warmer temps are still
progged to push into the region through Saturday and Sunday...with
highs in the 50s (possibly even low 60s Sunday). Winds will also be
persistent through the next several days. Breezy northwest winds
will continue through the weekend. A clipper system will cross the
area Monday driving in colder temps in the 30s and 40s...along with
strong northwest winds. It looks like winds Monday could reach
advisory criteria...and possibly high wind warning. Will have to
keep an eye on models trends for that system. Rest of the week will
be quiet with highs in the 40s and not-as-breezy winds. Next chance
for snow showers will be toward the end of the work week.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Saturday)
Issued At 1046 AM MST Fri Dec 8 2017

Gusty west/northwest winds will continue through this afternoon.
Gusts up to 50 knots are possible along the eastern slopes of the
Black Hills near KRAP. Low-level wind shear is expected at RAP
later this evening into early Saturday morning with northwest
winds at 50 knots around 2000 feet as surface winds lessen to
under 15 knots. Otherwise, VFR conditions will prevail.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Wind Advisory until 5 PM MST this afternoon for SDZ026-031-072-
     073.

WY...None.
&&

$$

DISCUSSION...13
AVIATION...Eagan



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