Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 170922
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
222 AM MST Tue Jan 17 2017

.SHORT TERM...(Today Through Wednesday Night)
Issued at 221 AM MST Tue Jan 17 2017

09z surface analysis had low over KPIA with weak high over the
CWA and lee trough from central MT into central CO. Some CI
spilling over ridge into the CWA.

Today through Wednesday, upper level ridge will build into the
northern plains with a downslope component to low level flow as well
as sustained warm air advection. This will push lee trough east as a
warm front. Battle between snow cover and warmer air will continue
with wide range in local temperature anomalies expected.

.LONG TERM...(Thursday Through Monday)
Issued at 221 AM MST Tue Jan 17 2017

Upper ridging will remain across the region Thursday, bringing
another relatively warm and dry day to the area. Cyclonic flow
will develop for the end of the week into the weekend, resulting
in cooler temps and better chances for precip. Even with this
trough developing, the best dynamics appear to stay west and south
of the region. Pops will remains minimal across much of the CWA.
High temperatures will return to the 30s during this period as
well as arctic air stays well north of the CONUS.

&&

.AVIATION...(For the 12Z TAFS Through 12Z Wednesday Morning)
Issued At 221 AM MST Tue Jan 17 2017

VFR conditions are expected through the forecast period.

&&

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

$$

SHORT TERM...Helgeson
LONG TERM...13
AVIATION...13


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