Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 180950

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
350 AM MDT Sun Jun 18 2017

.DISCUSSION...(Today Through Saturday)
Issued at 331 AM MDT Sun Jun 18 2017

Upper level analysis has broad trof continuing to shift east into
the Great Lakes region, while western ridge shifts onto the West
Coast. In between, fast northwest flow remains across the northern
Plains. Skies are mostly clear to partly cloudy across the area.
At the surface, high pressure resides across the northern Rockies.
Temperatures are cool at 3am, with readings in the 40s to lower

Today...Western CONUS upper ridge will build into the Great Basin,
and a warming trend will begin across the area. Highs will be in
the 70s, with mostly dry conditions. Hi-res convective models are
hinting at a few afternoon showers, supported by some weak
instability across the Black Hills and far northwest South Dakota.
Upper ridge will continue to build tonight, with mostly clear
skies expected. Lows will fall into the 50s, with some 40s across
the Black Hills.

For the upcoming week, strong upper ridging will keep weather
mainly warm and dry. Highs will be in the 80s and 90s by midweek,
with a slight cooldown expected towards the end of the week. Low
temperatures will warm back to the 50s and 60s for much of the
week. Some weak shortwave energy will cross the region late in the
week as the upper ridge begins to weaken. This will lead to some
small chances for shower and thunderstorms by Thursday and

.AVIATION...(For the 06Z TAFS Through 06Z Sunday Evening)
Issued At 522 PM MDT Sat Jun 17 2017

VFR conditions expected through the period. Some isolated showers
and thunderstorms will be possible over the Black Hills and far
northwestern SD during the afternoon.




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