646
FXUS63 KABR 070648
AFDABR

Area Forecast Discussion
National Weather Service Aberdeen SD
1248 AM CST Sat Nov 7 2026

.KEY MESSAGES...

- Dense fog has develop mainly over the Missouri River valley and
will spread east through the night into Saturday morning before
eventually dissipating.

- Temperatures today through next Wednesday are forecast to warm up
some 10 to 20 degrees above normal for early November, with highs in
the 50s and low 60s.

&&

.DISCUSSION...
Issued at 1248 AM CST Sat Nov 7 2026

Fog has developed over the Missouri River and areas just to the east
during the early nighttime hours. This fog will be spreading east
through the night into Saturday morning. A dense fog advisory has
been issued into Saturday morning as visibilities could drop below 1
mile at times in areas with the fog. Additionally, some areas that
experience the fog will have temperatures below freezing, which
could cause some freezing fog and localized areas of potentially
slick conditions. Southwestern winds west of the Missouri River will
keep the fog from spreading west. These southwest winds will spread
east through the night and will help erode the edge of the fog as it
moves east into the morning.

Through the morning into the afternoon, the winds will become more
westerly and will start to speed up. Wind gusts over most of central
and northeastern SD will be between 20-25 mph, with stronger wind
gusts up to 30 mph over Corson and Dewey counties and the eastern
edge of the Sisseton Hills north of HWY 12. Minimum relative
humidity values will be between 40-50% over Corson and Dewey
counties, and with the stronger winds and dry vegetation, the lower
humidity values will cause high Grassland Fire Danger Index values.
The higher humidity values and slightly lower wind speeds will keep
the Grassland Fire Danger Index values in moderate category for the
rest of central and northeastern SD.

Warmer air will be coming on the southerly and westerly winds today
through Monday. This will warm temperatures to be about 10-20
degrees warmer than normal for this time of the year, with highs in
the 50s to low 60s. Models show a frontal boundary move through on
Monday, which will turn the winds and start bringing in some colder
air. This cooler air won`t cool things too much, but will cool
temperatures over the following days to be around normal. While the
front will move cold air in and turn winds to be from the northwest,
the lack of moisture in the atmosphere will help to keep
precipitation from developing. The next chance for some isolated
rain showers looks to be Tuesday evening into Wednesday, though it
is only about 10-20% chance over northeastern SD. This is because
the models vary if anything does develop and the timing of it.
Models will likely change what will happen, so an eye will need to
be kept on the models if they change or come to an agreement.

&&

.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1046 PM CST Fri Nov 6 2026

Terminals KABR,KATY,KPIR,KMBG

We continue to monitor fog/low stratus as it develops close to
KMBG/KPIR and is expected to expand and cover all terminals with
IFR VISBY/CIGS. Improving conditions are anticipated through the
course of the day Saturday.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...Dense Fog Advisory until 9 AM CST this morning for SDZ004-005-
     009-010-016-017-034.
MN...None.

&&

$$

DISCUSSION...12
AVIATION...07