Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 111032

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
332 AM MST Sun Feb 11 2018

.DISCUSSION...(Today Through Saturday)
Issued at 330 AM MST Sun Feb 11 2018

Large upper trough is centered across the central CONUS with a
shortwave approaching the ND/Canadian border. Warmer air at the low
levels has been building back in from the west ahead of the next
cold front approaching MT/ND from the north. Temps are in the single
digits to well below zero. The exception is across the northern and
eastern foothills where downsloping winds are resulting in temps in
the upper teens to low 20s. Arctic cold front will approach the area
later today with light snow developing along the boundary. Northwest
SD may see light snow develop this afternoon, otherwise snow will
likely develop this evening across northeast WY into the Black Hills
area, then expand south and east through the night. QPF amounts
still expected to be light with around an inch or two of
accumulation by midday Monday. Snow may linger late Monday into
Monday evening across southwest to south central SD. Southwest flow
developing heading toward midweek will bring dry weather and warming
temps. After chilly singel digits highs Monday, temps will warm by
some 25 to 35 degrees Tuesday with highs reaching the 30s to low
40s. Warming will continue into Wednesday with highs in the 40s to
low 50s. The next cold front and chance for snow will be Wed night
into Thu. Drier and warmer weather is then possible toward the end
of the week.


.AVIATION...(For the 06Z TAFS Through 06Z Sunday Night)
Issued At 1008 PM MST Sat Feb 10 2018

VFR conditions will continue into early Sunday afternoon. MVFR
CIGS will move southward into far northwestern SD by 20z and into
northeastern Wyoming around 23Z on Sunday afternoon. Areas of MVFR
CIGS will continue to spread southward across much of the area
during the evening. Widespread IFR CIGS will develop along the
Black Hills around 02Z Sunday evening. Widespread LIFR conditions
are expected to develop over far southwestern South Dakota, near
the Nebraska border, after 05Z Sunday night.




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