Yankton, South Dakota 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

916
FXUS63 KFSD 241139
AFDFSD

Area Forecast Discussion
National Weather Service Sioux Falls SD
539 AM CST Sat Jan 24 2026

.KEY MESSAGES...

- Despite light winds, wind chills -20 to -30F will be common
  over the area through mid-morning, coldest north of I-90.

- Another night of dangerous cold is likely Sunday night, with
  a moderate to high (40-90%) chance of wind chills of -25 or
  colder mainly northeast of a Huron to Sioux Falls to Storm
  Lake line.

- Less cold temperatures for Monday onward, though still below
  normal for the last week of January. Light snow chances late
  tonight-Sunday, and again Tuesday night-Wednesday. Low (<20%)
  probability of snowfall reaching 1 inch in either period.

&&

.UPDATE...
Issued at 535 AM CST Sat Jan 24 2026

Advisory-level wind chills of -25F or colder looked to become a
little more widespread and persistent over our western counties
 as light southerly flow develops this morning, so expanded the
Cold Weather Advisory near/west of a Mitchell to Wagner line
through 9 AM. Conditions remaining marginal over the remainder
of southeast South Dakota and additional expansions are not
anticipated.

&&

.DISCUSSION...
Issued at 258 AM CST Sat Jan 24 2026

TODAY-SUNDAY NIGHT: Arctic high pressure moving through the
Upper Mississippi Valley and into the western Great Lakes today,
allowing a modest southerly flow to develop through the morning.
Winds may begin to increase just enough ahead of the rise in
temperatures to see advisory level wind chills (-25F or colder)
persist through 9-10 AM. Cannot rule out a brief dip to colder
wind chills toward south central South Dakota as the winds begin
to pick up prior to daybreak, or lingering an hour beyond the
current expiration, but overall the advisory remains on track.

Weak warm advection will help temperatures recover above zero in
most areas by this afternoon, with readings dropping back into
the single digits below zero tonight. A compact surface low
looks to develop in southwest-south central South Dakota tonight
in response to a mid-upper level wave dropping southeast across
the Dakotas. NBM maintains a dry forecast with this feature, but
deterministic models in fairly good agreement in producing some
light QPF across our South Dakota counties late tonight through
midday Sunday. Coordinated with neighboring offices to introduce
some low-moderate (20-40%) pops and light snow accumulation to
areas mainly west of I-29. While ensemble probabilities support
these chances for measurable snow, probabilities are generally
very low (<10%) that amounts will reach 1 inch. May have to
watch northwest portions of the forecast area, however, as the
HREF does indicate a small pocket of higher probabilities for
near/west of the James River Valley (Huron/Mitchell).

Another shot of colder air builds in behind this wave for Sunday
night, bringing our next period of advisory level wind chills
for later Sunday night into Monday morning. Probabilities remain
moderate to high (40-90%) that areas northeast of a line from
Huron-Sioux Falls-Storm Lake will see wind chills below -25F
Monday morning, with a low (~20%) probability of wind chills
reaching -35F in portions of southwest Minnesota.

MONDAY-WEDNESDAY: After bottoming out in the single digits and
teens below zero Monday morning, temperatures quickly recover
through the day Monday. This could be the warmest day of the
week ahead with highs from the teens in southwest Minnesota to
near/just above freezing in south central South Dakota. A dry
cool front moves through Monday night, followed by another weak
wave later Tuesday night into Wednesday. This latter wave will
have a bit more moisture to work with, but model differences in
the track of the wave are keeping pops on the low side for now.
The broader ensembles showing 30-50% chance of measurable snow
occurring on Wednesday, with low (~20%) probability of amounts
nearing an inch in portions of southwest Minnesota.

THURSDAY-FRIDAY: Low confidence in temperatures as we head into
the final days of January 2026, with NBM temperature spreads
climbing to as much as 30-40 degrees between the 10th and 90th
percentiles by Thursday and Friday. Somewhat higher confidence
that this period remains dry with <20% probabilities of seeing
measurable precipitation.

&&

.AVIATION /12Z TAFS THROUGH 12Z SUNDAY/...
Issued at 535 AM CST Sat Jan 24 2026

VFR conditions and relatively light winds will prevail through
this period, with a couple of exceptions.

First, areas west of I-29 will see occasional southerly gusts
15-20kt during the late morning through sunset today.

Second, an approaching wave will begin to produce MVFR level
clouds late in this period. At this time, confidence is not high
enough to include MVFR ceilings, but did include SCT020 at KHON
and KFSD to indicate potential timing. Eventually spotty -SN may
accompany these lower ceilings, but this should hold off until
after this TAF period.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...Cold Weather Advisory until 9 AM CST this morning for
     SDZ038>040-050-052>059-063-064.
MN...Cold Weather Advisory until 9 AM CST this morning for MNZ071-
     072-080-081-089-090-097.
IA...None.
NE...None.

&&

$$

UPDATE...JH
DISCUSSION...JH
AVIATION...JH