017
FXUS63 KABR 120251 AAB
AFDABR

Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
851 PM CST Tue Nov 11 2025

.KEY MESSAGES...

- High pressure will gradually nose into the area overnight
  allowing for lighter winds to develop.

- Above normal temperatures by a good 20-25 degrees and dry
  conditions will persist through the end of the week. Temps in
  the 60s to low 70s will be possible Friday which is close to
  record highs for some locales.

- Slightly cooler temperatures return this weekend into early next
  week with increasing rain chances(20%-25%) Monday into Tuesday.

&&

.UPDATE...
Issued at 846 PM CST Tue Nov 11 2025

Did go ahead and insert some patchy fog across the Missouri and
James River valleys for later tonight into early Wednesday
morning, per the hi-res guidance. Just a few patches of high
cirrus and mid-level stratus clouds streaming down over the region
this evening. This should not deter radiational cooling too much.
Light west-northwest (upslope onto the Prairie Coteau) surface
winds (less than 10 mph) and ambient air temperature cooling well
below afternoon dewpoint temperatures should end up generating
either some hefty levels of frost in the valleys or pockets of
fog. No other changes planned at this time. Updates are out.

UPDATE Issued at 554 PM CST Tue Nov 11 2025

See below for an aviation forecast discussion for the 00Z TAFs.

&&

.DISCUSSION...
Issued at 307 PM CST Tue Nov 11 2025

As of the 3 PM CST hour, skies were clear across a majority of
central and northeast SD and west central MN. We`re seeing just a
few high cirrus moving into north central SD from the northwest.
We saw a cold front slip south and east through the area earlier
this morning. It took most of the morning, but gusty northwest
winds of 25-35 mph have kicked in early this afternoon and look to
persist the remainder of the afternoon. Temperatures have
overachieved a bit this afternoon with readings in the 50s to low
60s(warmest across central SD). This has pretty much eroded any
leftover snow cover across our forecast area.

Sfc high pressure will gradually shift east into the western and
central Dakotas tonight into Wednesday morning. Gusty winds fall off
after sunset tonight as winds decouple. Temps will fall into the
upper 20s to low 30s. With today`s snowmelt, can`t completely
discount some brief shallow fog forming, particularly from the James
Valley west into parts of the Missouri Valley. It`ll depend on how
fast the high moves into the area and orients winds in a more
favorable way. Hi-res guidance doesn`t have a lot of support for fog
at this time however, so confidence is low. The sfc ridge axis sets
up over the forecast area on Wednesday. Lighter winds and slightly
cooler temps are expected. Instead of 925mb temps in the +8C to +15C
range like we`ve seen today, 925mb temps Wednesday will be knocked
back down to about a +4C to +12C range. Still, this is above climo,
so expect daytime highs to reach the upper 40s to mid 50s. Some
sunshine is expected, although there looks to be a few more mid to
high clouds filtering in during the day according to the latest HREF
guidance.

The sfc ridge will slip away from us to the east going into Thursday
and Friday. The forecast area will then fall into more of a
southerly low to mid level flow pattern. Upper ridging is progged to
build into the Northern Plains during this time. This will give us
at least a couple of dry and very mild days toward the end of the
week. Ensemble data is still pointing to 850mb temps about 2
standard deviations above climo on Friday. EC EFI data highlights a
warm TMAX with values of 0.6 to 0.9 on Friday. Current forecast NBM
values are within about 2 to 5 degrees of record highs for Pierre
and Mobridge. Highs should not have any problem reaching the 60s for
most locales with some low 70s possible in central SD. A tightening
gradient on Friday will lead to a breezy southerly winds. Given the
warm temps(20-25 degrees above normal) and dry conditions, some
areas could see elevated fire weather conditions. At this point,
doesn`t look like anything much above high grassland fire danger,
but something to monitor in the coming days.

Finally, going into this weekend and early next week, a bit of a
pattern change looks likely to begin taking place. Longer range
deterministic and ensemble guidance seems to be latching onto a
split flow upper air pattern developing. Compared to runs
yesterday that had a northern branch upper trough working across
the Northern Plains and a southern branch upper trough shifting
east across the Desert Southwest into the Central and Southern
Plains in tandem with each other, today`s runs are a bit
different. The northern branch of the jet with it`s upper trough
still works through our region this weekend, while the southern
branch lags back closing off an upper low across Baja California
into the Desert Southwest through the weekend. This is similar to
what these model runs showed 2 days ago. So, confidence isn`t the
best in the forecast for late in the period. Nonetheless, can`t
completely rule out some precip this weekend as a couple of
fropa`s work through the Dakotas, but moisture looks rather
limited. Inherited ensemble PoPs have completely removed mention
of precip now for Saturday into Sunday. Instead, ensemble guidance
takes that southern cut off upper low and shifts into out into
the Central Plains early next week as an open wave. This would
tend to lend more credence into increasing precip chances for
parts of our area Monday into Tuesday. We`ll have to watch these
trends as well in the coming days to watch for any shifts in the
data. Cooler temperatures are anticipated to return late in the
period as the upper trough moves through. Readings are expected to
return closer to normal for this time of November, although at
this point it still looks to be slightly above normal.

&&

.AVIATION /00Z TAFS THROUGH 00Z THURSDAY/...
Issued at 554 PM CST Tue Nov 11 2025

Terminals KABR,KATY,KPIR,KMBG

VFR conditions are forecast at all 4 terminals through this TAF
cycle. Light west to northwesterly winds will also prevail.

&&

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

$$

UPDATE...10
DISCUSSION...Vipond
AVIATION...10