Area Forecast Discussion
Issued by NWS Rapid City, SD

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000
FXUS63 KUNR 210956
AFDUNR

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

.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 06Z TAFS Through 06Z Sunday Night)
Issued At 1029 PM MST Sat Jan 20 2018

A storm system will continue to bring snow and flight
restrictions across the region tonight into Monday. Expect IFR
(local LIFR) conds in snow over the SE half of the FA tonight into
Sunday, with slow improvement from west to east Sunday. This
includes KRAP. The NW half will see mainly VFR conds, although a
few areas of MVFR conds can be expected just northwest of the main
snow band, where periods of light snow may develop. This includes
KGCC. South central SD will likely not see improving flight conds
until Monday morning, when the main upper low pulls away from the
region.

&&

.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-
     029-041.

     Winter Weather Advisory until noon MST today for SDZ026-028-030-
     031-074.

     Winter Weather Advisory until 2 AM MST Monday for SDZ032.

WY...Winter Weather Advisory until noon MST today for WYZ058.

&&

$$

DISCUSSION...7
AVIATION...JC



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