Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 100452
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1052 PM MDT Mon Oct 9 2017

.DISCUSSION...(This Evening Through Monday)
Issued at 226 PM MDT Mon Oct 9 2017

Current surface analysis shows Canadian high pressure building
into the region from the northwest, with clearing skies. Upper
level analysis shows low pressure sinking south-southeast across
the southern Rockies with general trough covering the Rockies and
high plains regions. Brisk west to northwest winds remain across
the area this afternoon with temps only in the 40s and lower 50s.

As high pressure settles over the region tonight, clear skies, light
winds, and dry air in place will produce chilly temperatures
overnight into early Tuesday. Widespread 20s can be expected for
lows, with some upper teens likely across usual cold spots of
northeast WY, the Black Hills, and southwest SD. Warmer air aloft
will build in late tonight and especially on Tuesday and Wednesday,
eventually allowing for a warming trend into midweek. Highs on
Tuesday will mostly be in the mid 50s to mid 60s, with mid 60s to
mid 70s on Wednesday.

The next cold front is progged to move through late Wednesday night
and Thursday morning, bringing another cooldown for the end of the
week. Large scale trough will dig southeast across the western US
late in the week, with unsettled southwesterly flow developing over
the region. Chances for showers will increase by Friday, especially
over northern and western portions of the forecast area. Trough is
progged to eventually swing across the area, with chances for
showers persisting through at least Saturday night. Temps look cold
enough for snow showers across at least the higher elevations during
the overnight and morning hours. Ridging behind the trough should
bring mainly dry and warmer conditions by early next week.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Tuesday Night)
Issued At 1052 PM MDT Mon Oct 9 2017

VFR conditions are expected through Tuesday.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Freeze Warning until 10 AM CDT Tuesday for SDZ049.

WY...None.
&&

$$

DISCUSSION...26
AVIATION...Johnson



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