Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 230837

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
237 AM MDT Fri Jun 23 2017

.DISCUSSION...(Today Through Thursday)
Issued at 234 AM MDT Fri Jun 23 2017

Two upper lows are spinning over parts of Canada, and
a wave associated with the Ontario low is pushing into the northern
plains, producing a few light showers over northeastern WY and
southwestern SD. An upper ridge is building over the west coast.
Under mostly cloudy skies, temperatures are falling into the 50s.
Following a cold front, winds are northwesterly, and gusty across
the western SD plains.

Showers will dissipate early this morning as the wave shifts
southeast and high pressure pushes into the region. Northwest
winds of 20-30 mph can be expected across the western SD plains
today, gradually decreasing this afternoon as the pressure
gradient slackens. Under mostly sunny skies, highs will be much
cooler, in the mid 60s to lower 70s. Lows tonight will be in the
40s on the plains, while the Black Hills could dip to the mid 30s.

Cool high pressure will keep highs about 10 degrees below normal on
Saturday, in the mid 60s to mid 70s. Chilly - but slightly warmer -
low temps can be expected again Sunday morning. Warmer air will
begin moving back in Sunday, and temps will rebound to the 80s and
low 90s early next week. Western CONUS upper ridge will keep
conditions dry through the weekend and into Monday. Models then hint
at a more active pattern towards the middle of next week, with
several waves moving through the region.


.AVIATION...(For the 06Z TAFS Through 06Z Friday Night)
Issued At 1129 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 few
sprinkles may occur overnight. MVFR CIGS will move through
northwest into central SD overnight and then move east of the
region by midday Friday.




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