Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 192032

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
232 PM MDT FRI AUG 19 2016

.SHORT TERM...(This Evening Through Saturday Night)
Issued at 232 PM MDT Fri Aug 19 2016

Water vapor imagery shows upper trough across the central CONUS with
the main axis crossing the MT/ND border into ne WY. Surface analysis
shows high pressure across MT pushing into the CWA. KUDX radar shows
band of showers has continued its eastward push across the CWA and
is now moving in cntrl SD. Behind it...weak showers associated with
cold pool aloft affecting parts of ne WY and far wrn SD. Precip will
continue eastward late this aftn into the evng as the trough axis
crosses the area. Precip is expected to clear far ern CWA border by
06z tonight. Rest of the instability showers will quickly dissipate
early this evng as diurnal cooling commences. High pressure
subsidence will then bring dry weather to the area for the remainder
of the night and through Saturday. Skies will clear out across the
area with temps dropping into the 40s/low 50s. Colder temps across
the higher BH are expected with lows in the mid to upper 30s. Highs
Saturday will be in the upper 60s/low 70s across the plains...and
60s across the BH. While dry weather is expected through the day
tomorrow...a secondary wave is progged to drop down the backside of
the departing trough. This wave will expected to bring some mid to
high clouds across wrn SD...more so toward cntrl SD. Clouds will
then clear out on the backside of the wave Sat evng. Temps Sat night
will again drop into the 40s across most areas.

.LONG TERM...(Sunday Through Friday)
Issued at 232 PM MDT Fri Aug 19 2016

Upper level ridge will quickly rebuild into the area for Sunday
and Monday bringing much warmer temperatures and rather low
relative humidities. Boundary layer moisture is too dry at this
point to have mentionable pops.

Upper trough moves through Tuesday through Thursday with cooler
temperatures. Moisture looks limited, but a few showers or
thunderstorms may develop as the system moves by. Temperatures will
be near normal Tuesday and then dropping below normal for the rest
of the week behind a cold front associated with the upper trough.


.AVIATION...(For the 18Z TAFS Through 18Z Saturday)
Issued At 232 PM MDT Fri Aug 19 2016

Large band of precipitation associated with cold front currently
pushing through Western South Dakota and Northeastern Wyoming.
Cigs/Vis have generally been in the MVFR/IFR categories within
this rain band. Gusty northwest winds have also been observed.
Drier air will work its way into western parts of our region late
this afternoon and give way to VFR cigs/vis. Expect VFR conditions
everywhere across CWA by tomorrow morning.


.UNR Watches/Warnings/Advisories...


LONG TERM...Helgeson
AVIATION...McKemy is the U.S. government's official web portal to all federal, state and local government web resources and services.