Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 230517

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1117 PM MDT Sat Apr 22 2017

.SHORT TERM...(This Evening Through Sunday Night)
Issued at 151 PM MDT Sat Apr 22 2017

Upper analysis shows ridging over the north central
and western CONUS. Mid/low clouds have been lingering over
northeastern WY, and cumulus clouds have spread across much of the
CWA this afternoon. Radar is picking up on a few weak echoes north
of the Hills. A low-level trough is crossing the Dakotas. Winds are
variable around 5-10 mph, and temps are rising into the 50s and
lower 60s.

Southwesterly winds will increase tonight across south central SD
between exiting high pressure and an incoming low, keeping lows in
the lower 40s there. Winds across northwestern SD will be light from
the southeast, and with max RH approaching 100%, added some fog
across northwestern SD through early Sunday morning.

As the surface low moves into eastern WY, southwesterly winds
will increase across south central SD, with easterly winds over
northwestern SD. This will result in temperatures ranging from the
lower 60s across northwestern SD to the mid 70s across the
southern and central SD plains. Temps in northeastern WY will be
near 70. The first of several upper waves will begin moving
through the region Sunday night, bringing chances for showers and
isolated thunderstorms.

.LONG TERM...(Monday Through Saturday)
Issued at 151 PM MDT Sat Apr 22 2017

Unsettled weather returns for the upcoming week as several
shortwaves cross the region. Daily chances for rain showers are
expected in most areas. Colder air could bring some overnight/early
morning snow to higher elevations depending on the timing of the
systems. At this point, the best windows for widespread
precipitation look to be Monday night into Tuesday morning, and
again Wednesday night into Thursday. Near average temperatures are
expected for Monday, with below average highs in the 40s and low
50s for the rest of the week.


.AVIATION...(For the 06Z TAFS Through 06Z Sunday Night)
Issued At 1114 PM MDT Sat Apr 22 2017

Area of IFR ceilings may develop across far northwest South
Dakota overnight, with ceilings improving Sunday morning. VFR
conditions elsewhere through Sunday evening. Low level wind shear
expected for the KRAP terminal overnight.




SHORT TERM...Pojorlie
LONG TERM...Pojorlie
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