Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 112152

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
252 PM MST Mon Dec 11 2017

.DISCUSSION...(This Evening Through Monday)
Issued at 237 PM MST Mon Dec 11 2017

Upper level analysis has highly amplified flow with trof to the
east and ridge to the west. In between, fast northerly flow
continues across the Northern Plains. Skies are mostly cloudy
across the SD plains, with partly cloudy skies across southwest SD
and northeast WY. At the surface, weak high pressure is located
across central Montana, nosing into the western Dakotas.
Temperatures at 3pm are in the upper 30s to mid 40s, with
northwest winds of 20 to 30 mph.

Eastern edge of upper ridge will shift into the area on Tuesday.
Warmer air will move into the area briefly, ahead of the next
upper shortwave. Highs will warm back into the 50s with much
lighter winds.

Another clipper will slide through the northern Plains Tuesday
night/Wednesday morning, producing a tight pressure gradient over
the area early Wednesday, so more downsloping wind will be
possible across the Black Hills overnight, and gusty northwest
winds are expected across the SD plains on Wednesday as well, and
highs will be in the 40s. A reinforcing shot of colder air and
continued breezy winds are expected for Thursday with another
passing shortwave. Upper ridging and a warm front will bring
another mild day Friday, but chances for precipitation increase
for the weekend as a stronger wave pushes through.


.AVIATION...(For the 18Z TAFS Through 18Z Tuesday)
Issued At 1026 AM MST Mon Dec 11 2017

MVFR CIGS will affect areas generally along and east of a line
from K2WX-KVTN through 23z with VFR conditions thereafter.
Elsewhere, VFR conditions will persist through the period. Gusty
northwest winds will gradually decrease in strength later during
the afternoon.


SD...Wind Advisory until 5 PM MST /6 PM CST/ this afternoon for



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