Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 222328
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
528 PM MDT Thu Jun 22 2017

.DISCUSSION...(This Evening Through Thursday)
Issued at 254 PM MDT Thu Jun 22 2017

A quiet weather pattern is expected for the CWA through much of the
forecast. Latest obs show mostly sunny skies with temps reaching the
70s to near 80 across the plains...and 60s and 70s over the Black
Hills. Central Canadian upper low is continuing to drift
east/southeast toward the Great Lakes with a secondary upper low
pushing into central Canada. A cold front is now crossing northwest
MT with breezy northwest winds and temps in the 50s/60s behind the
boundary. This front will quickly cross the region tonight with
temps dropping into the 40s across the plains and 30s over the
higher Black Hills. Some location could approach or break record
lows especially across the higher northern Black Hills into
northeast Wyoming. Northwest winds today will weaken this
evening...then strengthen again following the frontal passage. Cool
surface high pressure and the backside of the upper trough will keep
dry conditions across the CWA through the end of the week into the
weekend. Temps will be in the mid 60s to mid 70s through
Saturday...and low to upper 70s Sunday. Low level return flow behind
the departing surface high will bring more seasonable temperatures
to the area for the first half of next week with highs reaching the
80s. The next chance for rain will be toward the middle part of next
week as medium range models show an upper trough crossing the
western CONUS.

&&

.AVIATION...(For the 00Z TAFS Through 00Z Friday Evening)
Issued At 527 PM MDT Thu Jun 22 2017

VFR conditions will prevail over northeast WY and west central
into south central SD through the period with gusty northwest
winds at times, especially on the northwest SD plains. A patch of
MVFR CIGS will invade northwest into central SD later tonight and
then move east of the region by midday Friday.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...13
AVIATION...Helgeson



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