534
FXUS63 KABR 092322 AAA
AFDABR

Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
622 PM CDT Fri Oct 9 2026

.KEY MESSAGES...

- Much above normal temperatures will continue tonight through
  Saturday. Low temperatures tonight and high temperatures
  tomorrow will range between 20-30 degrees above normal.

- Strong southerly winds gusting 30-40 mph will impact south central
  and northeast South Dakota into west central Minnesota tonight
  through Saturday, with local gusts up to 45 mph along favored
  downslope wind areas of the Prairie Coteau.

- Strong winds, high temperatures in the 80s to low 90s and low
  relative humidity will create elevated fire weather conditions
  across central and northeast South Dakota and west central
  Minnesota on Saturday.

- Pattern changes to cooler temperatures Saturday night into Sunday,
  along with increasing chances for rain next week.

&&

.UPDATE...
Issued at 620 PM CDT Fri Oct 9 2026

The forecast remains on track this evening. No major changes are
planned.

&&

.DISCUSSION...
Issued at 247 PM CDT Fri Oct 9 2026

Main challenges in the short range will be much above normal
temperatures, near record levels in fact, along with the combination
of the stronger wind and low RH values leading to elevated fire
weather conditions for parts of the CWA through Saturday. Upper flow
pattern will feature shortwave ridging aloft developing through
tonight as a southwest flow aloft regime sets up as a western CONUS
upper trough digs into the Desert SW this weekend into early next
week. This digging system will eventually lead to noticeable weather
changes next week compared to our current warm and dry pattern.

High clouds will continue to drift overhead out of MT and ND
tonight. Low level moisture return on southeast flow this afternoon
into tonight will continue to advect 50s dewpoints into the forecast
area. The southeast breezes from the afternoon will diminish a bit
tonight but remain elevated enough to keep a mild air mass in place.
Overnight lows in the low to mid 60s for most of our zones will be a
nice set up to see record warm overnight lows. Sfc low pressure
tracking out of eastern MT into western ND overnight will help draw
a warm front through the area enhancing this above normal
temperature pattern. The sfc low is progged to track northeast
toward northeast ND on Saturday. A pre-frontal trough will work into
central SD Saturday morning as a cold front sets up from northeast
ND into southwest SD by late Saturday afternoon into Saturday night.
A tight gradient across the region will lead to south to southwest
wind gusts of 30-40 mph across northeast SD and west central MN
later tonight through Saturday. A downsloping wind effect will lead
to locally higher gusts around 45 mph across the eastern slopes of
the Prairie Coteau late tonight into Saturday. Added patchy blowing
dust on Saturday to those areas across northeast SD that would be
most susceptible to the strong winds kicking up dust, especially out
of agricultural areas.

With a deep south to southwest flow setting up on Saturday across
the forecast area and a warm air advection regime establishing 925mb
temps into a +25C to +30C range, daytime readings should have no
problem reaching the 80s to low 90s. Bumped up these values once
again closer to the 90th percentile given how anomalous this warm
air mass will be. The combination of the strong wind and these temps
will drive RH values down into a 20-25 percent range across central
SD and a 25-30 percent range from the James Valley and points east.
The tricky part to the fire weather forecast in this situation is
winds across central SD are expected to diminish in the afternoon
while winds across our east remain gusty. So, we have the lowest RH
in areas with less wind but higher RH values in areas with stronger
winds. Will have to take this into consideration if conditions
warrant to issue any fire weather headlines. The strong winds itself
across our east may be enough to warrant a wind headline, but at
this time will have incoming shifts have another look at guidance
tonight and make those decisions. Mainly dry conditions are expected
through most of the weekend, although can`t rule out some shower
activity entering north central SD the latter half of the weekend or
certainly by late Sunday.

This will be the beginning signs of changes to come going into early
next week. That cold front will slowly push east on Sunday into
Sunday night. Cold air advection could start setting up across north
central SD as early as late Saturday/early Sunday. Eastern zones
will hang onto the warmer air mass one more day with highs in the
70s to low 80s possible across northeast SD and west central MN.
More widespread rain chances move in by early Monday morning and
spread east through the day. Lack of any forcing mechanisms should
lead to more widely scattered light rains with the bulk of any
precip falling across our northern and western zones. A much cooler
air mass will infiltrate the area Monday leading to daytime highs
stuck in the 50s to around 60. Once that upper trough kicks out into
the central US toward the middle of next week, a better chance for
more widespread, steadier rainfall can be expected Wednesday into
Thursday. Temperatures are expected to remain below normal through
most of the next week with daytime readings in the 50s to mid 60s
and overnight lows in the 30s and 40s. We might even be cold enough
with the right conditions setting up late next week for some frost
into parts of our forecast area.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 620 PM CDT Fri Oct 9 2026

Terminals KABR,KATY,KPIR,KMBG

VFR conditions are expected through Saturday afternoon. Gusty
southerly winds will shift to the northwest behind a cold front
Saturday afternoon and evening.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.

&&

$$

UPDATE...20
DISCUSSION...Vipond
AVIATION...20