Area Forecast Discussion
Issued by NWS Rapid City, SD

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000
FXUS63 KUNR 252040
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
240 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 18Z TAFS Through 18Z Tuesday)
Issued At 225 PM MDT Mon Sep 25 2017

Widespread MVFR/IFR conditions will continue with local LIFR
conditions around the Black Hills area. Conditions will then
gradually improve to VFR this evening and overnight as precip ends
and clouds clear out. VFR conditions are then expected through
the rest of the forecast period.

&&

.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...Pojorlie



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