Area Forecast Discussion
Issued by NWS Rapid City, SD

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069
FXUS63 KUNR 211705
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1005 AM MST Sun Jan 21 2018

.UPDATE...
Issued at 1003 AM MST Sun Jan 21 2018

Snow is diminishing across SW SD and have removed
warnings/advisories for all of Pennington and Custer counties.
Will probaby be able to also remove at least Fall River county by
early afternoon based on radar trends. Still looks like a healthy
amount of snow for all of south central SD through tonight and
current warnings for that area look good.

&&

.DISCUSSION...(Today Through Saturday)
Issued at 250 AM MST Sun Jan 21 2018

Current surface map shows low deepening over southwest Kansas as
upper low moves through the four corners region. Snowfall
continues across portions of northeast Wyoming into southwest
South Dakota...along and south of a line from Newcastle to Rapid
City and Philip. Banded nature of snow has resulted in variable
snowfall amounts...with less than an inch at the NWS office but
around 3 inches just a few miles south of the office. Little
change in the forecast at this time. Best forcing shifts into
southwest/south central South Dakota this morning, with snow
ending from the north. Dropped southern Campbell County from the
advisory, no change to the remaining headlines.

Weak shortwave in northwest flow will cross the area Monday
evening, with a chance of snow across northeast Wyoming into the
Black Hills. Dry and cool conditions will prevail for much of the
week. Next upper trof crosses the northern plains Friday-Saturday
will bring next chance of widespread precipitation.

&&

.AVIATION...(For the 12Z TAFS Through 12Z Monday Morning)
Issued At 440 AM MST Sun Jan 21 2018

MVFR/IFR conditions with snowfall will continue across
southwest and south central SD this morning, with areas of LIFR
conditions possible. Snowfall will taper off and end from west to
east across these areas during the afternoon and evening, with
conditions improving to VFR in most areas soon after the snow ends,
with the exception possibly being over parts of south central SD.
At KRAP, a few flurries are possible early this morning, but snow
has generally ended with VFR conditions expected through the day.
Elsewhere across most of northeast WY and northwest SD, VFR
conditions are expected through tonight.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Winter Storm Warning until 2 AM MST Monday for SDZ042>044.

     Winter Storm Warning until 6 AM CST Monday for SDZ046-047-049.

     Winter Storm Warning until 5 PM MST this afternoon for SDZ027-
     041.

     Winter Weather Advisory until 2 AM MST Monday for SDZ032.

WY...None.
&&

$$

Update...Johnson
DISCUSSION...7
AVIATION...26



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