Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 261725

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1025 AM MST Sun Jan 26 2020

.DISCUSSION...(Today Through Saturday)
Issued at 300 AM MST Sun Jan 26 2020

The latest analysis shows an upper ridge over the Rockies with a
low pressure system sliding southeastward across North Dakota. A
surface front currently over northeastern Montana and western
North Dakota will sag southward into northwestern South Dakota
today, accompanied by low clouds and possibly a few flurries.
High temperatures will vary greatly across the area today, ranging
from the lower to mid 30s behind the front over northwestern
South Dakota with mid to upper 40s over parts of northeastern
Wyoming and southwestern South Dakota. The surface boundary will
continue to back southwestward across western South Dakota and
into northeastern Wyoming tonight, with low stratus and areas of
fog developing, especially along the northern and eastern
foothills. As the upper ridge moves off to the east, a shortwave
trough will affect the area on Monday. Some light snow will be
possible over northeastern Wyoming, the Black Hills and
southwestern South Dakota, where the low to mid-level
frontogenesis will be concentrated along the NW-SE oriented
surface boundary. Most of that area will experience little or no
snow accumulation. Seasonably mild and relatively unsettled upper
flow will continue through the rest of the week with slight
chances for rain or snow on many days. Much warmer than average
temperatures are expected for next weekend before the next round
of cold air arrives early next week.


.AVIATION...(For the 18Z TAFS Through 18Z Monday)
Issued At 1020 AM MST Sun Jan 26 2020

VFR conditions will continue across west-central SD and northeast
WY for much of the day today.

A cold front draped across far SW ND/NW SD will slowly push
southward this afternoon and evening. IFR/LIFR ceilings and
visibilities are occurring in this area and will spread southward
through the day. These low clouds should arrive in KRAP by 00-01z
this evening. The low ceilings will persist through Monday morning
as light snow and rain showers arrive by late Monday morning.




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