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000
FXUS63 KUNR 220958
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
358 AM MDT Thu Jun 22 2017

.DISCUSSION...(Today Through Wednesday)
Issued at 339 AM MDT Thu Jun 22 2017

Upper level analysis has fast zonal flow across the Pacific
Northwest through the northern Plains, with strong upper low over
Manitoba. Skies are partly to mostly cloudy across the area with a
band of showers and thunderstorms across northern and central SD.
At the surface, high pressure resides across the northern Rockies
into the far northern Plains, with the cold front now south and
east of the forecast area. Temperatures at 3am are in the upper
50s to mid 60s with light winds out of the north to northeast.

Today...Morning showers and thunderstorms will continue to slowly
shift east this morning across the South Dakota plains, exiting
the area around mid day. Cooler air will move into the area
this morning, with highs only in the 70s to around 80 degrees.
Northwest winds behind the cold front will be breezy again across
the South Dakota plains at 15 to 25 mph with some higher gusts.
Partly cloudy skies are expected tonight with lows falling into
the 40s to lower 50s.

Friday/Weekend...As the Manitoba upper low shifts east, a broad
upper trof will settle across the northern CONUS for Friday and
into the weekend, with Friday and Saturday being the coolest days.
High temperatures will only climb into the 60s to lower 70s, and
low temperatures will mainly be in the 40s. Some 30s will be
likely across the Black Hills. Precipitation chances remain low
during the weekend. Sunday will be slightly warmer with highs in
the 70s.

Early next week...Upper level ridge will build back across the
Rockies and northern Plains, with a warming trend into the middle
of next week. Mainly dry conditions are expected with the
exception of a weak upper shortwave that may bring some precip to
the area on Tuesday. High temperatures will generally be in the
80s, with 70s in the Black Hills.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Thursday Night)
Issued At 1111 PM MDT Wed Jun 21 2017

Isolated/scattered -TSRA with local MVFR conditions will continue
through early Thursday morning, mainly north and east of the Black
Hills, although some storms will occur over far northeast WY
through 09z. Otherwise, VFR conditions are expected with gusty
northwest winds on the plains Thursday.


&&

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

$$

DISCUSSION...15
AVIATION...Helgeson