Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 241722

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1122 AM MDT Sat Jun 24 2017

.DISCUSSION...(Today Through Friday)
Issued at 151 AM MDT Sat Jun 24 2017

Broad upper trough persists over the eastern CONUS,
and an upper ridge builds over the west. Water vapor shows a
Canadian low spinning southeastward into ND. Skies across western SD
and northeastern WY are mostly clear. At the surface, high pressure
stretches from the northern Rockies into KS, and winds across the
CWA are light and generally westerly. Temperatures at 2 AM are
mainly in the 40s, with some 30s over the Hills and northeastern WY.

As ND upper wave slides into MN/WI today, the pressure gradient will
tighten across central/eastern SD, and northwest winds will become
gusty across the western SD plains. Meanwhile, warmer air will begin
moving back into the CWA as the thermal ridge approaches from the
west. Highs today will be in the 70s. With the surface high over the
northern plains tonight, light winds and mostly clear skies will
contribute to another round of chilly morning lows in the 40s across
the plains and 30s in the Hills.

The warming trend will continue into early next week, along with dry
weather, as the upper ridge moves over the central states. Tuesday
looks like the warmest day of the week, with highs in the mid 80s to
mid 90s. A series of waves associated with an upper trough will
begin to break down the ridge Tuesday. Models continue to show a
more active pattern for the rest of the week, with showers and
thunderstorms returning, along with a slight cooling trend.


.AVIATION...(For the 18Z TAFS Through 18Z Sunday)
Issued At 1116 AM MDT Sat Jun 24 2017

Gusty northwesterly winds this afternoon will gradually wane
overnight tonight and into Sunday. Otherwise, VFR conditions are
expected through the period.




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