897 
FXUS63 KUNR 160958
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
358 AM MDT Fri Jun 16 2017

.DISCUSSION...(Today Through Thursday)
Issued at 330 AM MDT Fri Jun 16 2017

Broad upper low continues to drift across southern Canada north 
of Minnesota with near zonal flow from the Pacific Northwest, 
across the northern Rockies, and into the northern Plains. Weak
shortwave energy is crossing the region at the moment, bringing 
some clouds and isolated sprinkles to the area. Temperatures at
3am are currently in the 50s and 60s with light winds. 

Today...Upper flow remains nearly zonal as weak shortwave energy
continues to cross the forecast area. Some very light rain showers
will be possible across northwest SD this morning. Models are
showing a very weak 700mb trof crossing the area by early
afternoon. That combined with peak heating should enhance shower
chances across the Black Hills and northwest SD, with an isolated
thunderstorm or two possible by mid to late afternoon. Highs will
again be in the upper 70s to upper 80s. Some breezy winds will be
possible across northwest SD and also across southern portions of
Campbell County in WY today.

Tonight...A stronger shortwave is progged to cross southern 
Montana and northern Wyoming late tonight, along with a cold 
front. This will bring the best chance of precipitation to the
area for some time. Right now the best chances of showers and 
isolated storms will be over northeast Wyoming...the northern 
Black Hills...and into northwest South Dakota after midnight. Lows 
will be in the 50s.

Saturday...Zonal flow continues as the upper shortwave shifts 
east of the area during the morning. Some lingering rain showers 
and isolated thunderstorms will be possible from the Black Hills 
and east during the morning, with precip shifting east by the 
afternoon. Cooler temperatures are expected behind the cold front,
with highs in the upper 60s to upper 70s. Northwest winds will be
breezy across much of the area. Lows Saturday night will fall 
into the 50s, with some 40s across northeast WY and the Black 
Hills.

Sunday into next week...Strong upper ridging will build back into
the region with generally dry weather expected. Mainly 70s are
expected on Sunday, with temperatures warming into the 80s and 90s
by Monday and Tuesday. The warm temperatures will stick around
through Thursday, with slightly cooler temperatures by Friday. Low
temperatures will warm back to the 50s and 60s for much of next
week. 

.AVIATION...(For the 06Z TAFS Through 06Z Friday Night)
Issued At 1059 PM MDT Thu Jun 15 2017

VFR conditions will persist through today. Isolated thunderstorms
are possible this afternoon over the Black Hills. Clouds, showers
and thunderstorms will be on the increase this evening across 
parts of northeastern Wyoming, the Black Hills and northwestern 
South Dakota. 

&&

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

$$

DISCUSSION...15
AVIATION...MLS