Revillo, South Dakota Weather Forecast Discussion

067
FXUS63 KABR 210541 AAB
AFDABR
Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
1241 AM CDT Sun Sep 21 2025
.KEY MESSAGES...
- Focus turns to fog potential tonight into Sunday morning, mainly
  across central and north central South Dakota. Visibility may be
  reduced to below 1 mile at times.
- Temperatures are expected to warm up on Sunday, with highs
  reaching the upper 70s on Monday, around 5 degrees above normal.
  Highs will become near-normal by the middle of next week.
&&
.UPDATE...
Issued at 1237 AM CDT Sun Sep 21 2025
Aviation discussion updated below for the 06Z TAFs.
UPDATE Issued at 611 PM CDT Sat Sep 20 2025
So far no major changes to the forecast. Focus is on stratus in
the east eventually lowering while for central/north central SD
concern remains fog formation.
&&
.SHORT TERM /THIS EVENING THROUGH SUNDAY NIGHT/...
Issued at 237 PM CDT Sat Sep 20 2025
At 2 PM CDT, skies are partly to mostly cloudy over most of the
forecast area. Temperatures have been slowly warming through the 60s
into the low 70s on north-northwesterly winds generally at or below
10 mph. There have been occasional rather light blips on radar where
sprinkles/very light rain showers have been trying to develop across
northeast South Dakota into west central Minnesota this afternoon.
An upper level low/longwave troughing will be over Minnesota and the
eastern Dakotas during the period, while weak surface high pressure
over the CWA lingers into Sunday night. Ensemble cloud-cover guidance
shows appx the western half of the CWA clearing of this
evening/overnight, while remaining, for the most part, in tact
across the eastern half of the CWA. Noticing the HRRR/HRRRTL and
RAP/RAPTL guidance sets were showing lower visibility/fog developing
across the west tonight, where the sky is forecast to be clear. So,
leaned on that guidance and continuing the mention of fog later
tonight/early Sunday morning mainly across the western half of the
CWA. Looking at the RAP model in BUFKIT for any drizzle/lower
visibility potential across the eastern third of forecast zones (the
Prairie Coteau over into west central Minnesota) tonight, but not
seeing the type of deep/saturated stratus layer signal in the model
soundings that favors drizzle. So, at this time, not incorporating
any drizzle/reduced visibility over that area of the CWA for tonight.
Dry, with increasingly sunny skies, and near to slightly above
normal temperatures are anticipated on Sunday throughout the CWA.
&&
.LONG TERM /MONDAY THROUGH SATURDAY/...
Issued at 237 PM CDT Sat Sep 20 2025
Monday morning, we are sandwiched between 2 upper level troughs, one
over southern Ontario and the other over western MT. This second low
moves south late Monday before heading pretty much straight east
across KS. The 850mb low for this system moves across western SD on
Monday. We then are in northeast upper level flow until that low
sinks farther south and we move into more north to northwesterly
flow Thursday. We stay in this pattern through the end of the period.
There`s not much active weather during the period. With that low on
Monday there are some 20-30% PoPs mainly in Stanley, Jones, and
Lyman counties Monday evening, but that`s it through the end of the
period. Accumulations are expected to be light, maybe a couple
hundredths of an inch. Temperatures through the long term will be
right around average with highs in the 70s.
&&
.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1237 AM CDT Sun Sep 21 2025
Terminals KABR,KATY,KPIR,KMBG
Areas of BR/FG are forecast to develop through the early morning
hours Sunday. VSBY may be reduced to IFR at times. Cannot rule out
areas of IFR CIGs as well, mainly over northeast SD possibly
affecting KABR/KATY. Whatever BR/FG/stratus that develops early
Sunday morning is expected to burn off by mid morning, leaving
behind VFR conditions through the rest of the TAF period.
&&
.ABR WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
&&
$$
UPDATE...TMT
SHORT TERM...10
LONG TERM...13
AVIATION...TMT

NWS ABR Office Area Forecast Discussion