Area Forecast Discussion
Issued by NWS Rapid City, SD

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179
FXUS63 KUNR 260456
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1056 PM MDT Mon Sep 25 2017

.DISCUSSION...(This Evening Through Monday)
Issued at 225 PM MDT Mon Sep 25 2017

Water vapor shows upper low over central WY, with a deep moisture
plume through the Plains, including our south central SD zones.
While there are a few showers over the northern Black Hills this
afternoon, the best chance of showers will occur this evening
over south central SD as robust wave lifts northward out of the
Central Plains.

Upper low is then expected to shift into western ND overnight,
with showers coming to an end and clouds eroding in our
western/southwestern zones. With surface high settling over the
NEB panhandle, will see areas of frost developing later tonight
from northeast WY into far southwest SD where skies will clear, so
will issue a Frost Advisory for these areas. More cloud cover
expected further north which will limit frost potential.

Dry and warmer weather then expected the remainder of the work
week with weak ridging aloft. An upper low over the Desert
Southwest is then expected to lift northeast and get picked up by
the next upper trof spreading into the Pacific Northwest. This may
lead to a slight increase in precip chances over the weekend into
early next week.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Tuesday Night)
Issued At 1055 PM MDT Mon Sep 25 2017

Isold shra possible through early Tue morning western SD. MVFR
conds expected over NW through scentral SD overnight with conds
improving far west as drier air works into the region. Areas of
MVFR-IFR conds possible around the Black Hills into the adjacent
NE WY plains late tonight into Tues morning. VFR conditions are
then expected all places late Tues morning and afternoon.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Frost Advisory from 3 AM to 7 AM MDT Tuesday for SDZ027-041-042-
     044.

WY...Frost Advisory from 3 AM to 7 AM MDT Tuesday for WYZ054>056-058.

&&

$$

DISCUSSION...Johnson
AVIATION...JC



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