textproduct: Aberdeen

KEY MESSAGES

- Patchy fog of 3 to 5 miles over northeastern SD/west central MN today to expand to south central SD tonight into Sunday morning with visibility down to 1 miles or less.

- Rain late Sunday night into Monday over portions of central SD will expand to northeastern SD Monday night. This area will exit across northeastern SD/west central MN late Monday night and slowly end west to east during the day Tuesday.

- There is a 50-80% chance of 0.75" or more rain over north central SD, mainly north and west of a line from Redfield to Britton.

UPDATE

Issued at 629 PM CDT Sat Sep 26 2026

Updated the forecast by increasing the areal coverage of fog later tonight into Sunday morning. Some model guidance is suggesting visibility below one half mile at times for a large section of the CWA.

DISCUSSION

Issued at 138 PM CDT Sat Sep 26 2026

The pressure gradient will continue to weaken through tonight as the surface low over western SD/NE and associated through over western SD moves east across our forecast area. This will set the stage for another night of fog. Patchy fog over northeastern South Dakota and west central Minnesota will expand to south central SD tonight into Sunday morning, with visibility down to 2 miles or less. The trough will be across southeastern SD into west central MN at 12Z, with a cold front stretching from a deep low over central Canada through northwestern MN and bisecting SD northeast to southwest.

The main impact to this cold front sinking to our south during the day Sunday will be the exit of some of the thicker low level moisture. There is low confidence in peaks of sunshine that many people haven't been seen in around a week across northeastern SD and west central MN. We'll see where a band of thicker clouds remains Sunday (over central or eastern SD).

Taking a look 500mb flow, steady flow out of the southwest will dominate our weather pattern late Sunday through at least Tuesday of next week. This will help to bring rain to central SD Sunday night into Monday that will move across northeastern Monday night before exiting east during the day Tuesday. A few rumbles of thunder will accompany these showers. The WPC excessive rainfall outlook for this period is in the marginal range, with a 50-80% chance of 0.75" or more rain over north central SD, mainly north and west of a line from Redfield to Britton.

Dry weather will return Tuesday through the rest of the forecast period. While high temperatures are forecast to be in the upper 60s to mid 70s through Wednesday, they will drop mainly into the 60s Thursday through Saturday. Lows should remain in the 50s through Thursday morning, with 40s Friday and Saturday morning.

AVIATION /00Z TAFS THROUGH 00Z MONDAY/

Issued at 629 PM CDT Sat Sep 26 2026

Terminals KABR,KATY,KPIR,KMBG

Pockets of VFR conditions can be expected at KMBG and KPIR through this evening, before widespread low cigs and patchy fog develops later tonight into the morning hours on Sunday. Both terminals may see clearing during the mid morning hours. KABR and KATY will likely see IFR conditions with both low cigs and visibility later this evening and into the morning hours on Sunday. KATY may see IFR conditions the longest.

ABR WATCHES/WARNINGS/ADVISORIES

SD...None. MN...None.