Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 211734

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1034 AM MST Sun Jan 21 2018

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 probably 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 18Z TAFS Through 18Z Monday)
Issued At 1030 AM MST Sun Jan 21 2018

MVFR/IFR conditions with snowfall will continue across far
southwest and south central SD this afternoon, with areas of LIFR
conditions likely. Snowfall will taper off and end from west to
east across these areas during the evening, with conditions
improving to VFR in most areas soon after the snow ends. The
exception will be over parts of far south central SD where snow
will continue through tonight.


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-

     Winter Weather Advisory until 2 AM MST Monday for SDZ032.



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