textproduct: Aberdeen

KEY MESSAGES

- Patchy fog will be possible overnight due to the melting snow and diminishing winds.

- Below normal temperatures will continue through Tuesday. Monday will be the coldest day, with highs mainly in the 30s, or around 15 to 20 degrees below normal.

- Winds out of the southwest will gusts 30 to 40 mph during the daytime hours Tuesday.

UPDATE

Issued at 829 PM CDT Sat Apr 4 2026

Not much in the way of cloud cover across the CWA as the storm system is now well off to our east. Reduced sky cover across the area this evening based on latest satellite trends. Patchy fog still possible across parts of the area late tonight into early Sunday morning and will leave mention of this in the forecast. Otherwise, looking for lows to drop into the 20s.

DISCUSSION

Issued at 234 PM CDT Sat Apr 4 2026

As of 19Z we still have an area of light to moderate snow over far northeastern SD and west central MN. Observations at Wheaton and Ortonville were showing visibility in the falling snow down to 1 mile. As has been the case, once the snow ends the visibility has been able to quickly rise to 6 miles or greater. Given the winds out of the northwest gusting 25 to 35 mph over newly fallen snow, there are some indications of low level drifting snow. However, the warm temperatures (in the 30s) and warm road temperatures have resulted in only isolated drifting that has mainly melted.

The melting snow today will result in increasing low level moisture. While we don't have a perfect light wind night, it may still be enough to allow for fog development as temperatures fall into the 20s - along with the dewpoints. The main areas of concern look to be over Brown and Spink Counties east, but it will be depend on how much snow is on the ground as limited snow remains over Spink County. While the potential is mentioned here and in the weather story (social media), we will need to monitor the latest trends so see how broad impacts may be.

The latest surface weather map shows the exiting low over the Upper Great Lakes, with a trough extending through out area. The 500mb low is over far northern WI. The surface high will be over western and central SD by 00Z, allowing for quickly diminishing winds before the high sinks south.

A weak trough moving across ND and clipping northeastern SD/west central MN Sunday will bring increased cloud cover and a 20% chance of light rain/snow. Little to no accumulation is expected at this time.

Colder high pressure will sink in from central Canada Monday, with temperatures maxing out in the 30s over much of the area. We're near the 70th percentile Monday, so a slightly lower temperature will be possible. The surface high will be over far northeastern SD and MN by 06Z Tuesday. The pressure gradient will increase behind the strong surface high Tuesday afternoon, with gusts out of the southwest 30 to 40 mph during the daytime hours. Fire weather concerns look limited despite the strong winds, not only because of the recent precipitation, but with the forecast of minimum relative humidity values mainly at 45% or higher.

Farther out, we'll be watching for an area of low pressure to slide across southern Canada through the Northern Plains Tuesday night through Wednesday. At this time, the chances of precipitation stay mainly to our north or south. Precipitation chances increase Thursday into Friday (30-40%) as low pressure organizes to our south and southwesterly flow pushes in aloft.

AVIATION /00Z TAFS THROUGH 00Z MONDAY/

Issued at 624 PM CDT Sat Apr 4 2026

Terminals KABR,KATY,KPIR,KMBG

VFR conditions are forecast through the TAF period. There is some potential for patchy fog over portions of the region late tonight into early Sunday morning. Although, low confidence on areal coverage and actual occurrence of any fog, so will leave out mention at this time and evaluate again for the 06Z TAFs.

ABR WATCHES/WARNINGS/ADVISORIES

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