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000
FXUS63 KUNR 250349
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
949 PM MDT Sat Jun 24 2017

.DISCUSSION...(This Evening Through Saturday)
Issued at 306 PM MDT Sat Jun 24 2017

Northwest flow continues across the northern Plains today as the
broad trough drifts eastward over the MS valley. Upper ridging is
building across the western third of the CONUS. Cool Canadian
airmass over the CWA has limited temps to the upper 60s to upper
70s so far today...and 50s to mid 60s over the Black Hills.
Surface high pressure will remain over the region tonight with
light winds and another cool night with lows in the mid 30s to mid
40s. Northwest flow will persist into Sunday along with cooler
temps...although warmer than today. Highs Sunday will reach the
upper 60s to near 80. Northwest winds will return...but not as
breezy as today. Dry weather will continue through Monday and
Monday night. Return flow setting up Monday will begin to warm up
the CWA back to more seasonable temps from west to east. Highs
will be back in the 80s Monday over northeast Wyoming...then 90s
area wide Tuesday as southerly flow ramps up and upper ridging
centers across the northern Plains. A shortwave and increasing
southwest flow through the day could bring the next chance for
precipitation late Tuesday into Tue evening as a cold front
crosses the region. Models are showing better chances of storms
for the second half of next week as a more active pattern develops
with several upper waves crossing the region. Temps will be more
seasonable during this period.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Sunday Night)
Issued At 949 PM MDT Sat Jun 24 2017

VFR conditions are expected through the period.

&&

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

$$

DISCUSSION...13
AVIATION...JC