textproduct: Aberdeen

KEY MESSAGES

- Light snow expected to exit by this evening. Accumulations of up to 1 inch will be possible.

- Another round of light accumulating snow moves in on Wednesday with generally less than an inch expected.

- Gusty northwest winds develop on Wednesday ranging from 35-50 mph with the strongest winds expected across central South Dakota. Blowing snow and reduced visibilities are expected, especially in falling snow. A Winter Weather Advisory has been issued.

- Very cold temperatures and dangerous wind chills expected Thursday through Sunday morning. The coldest period will be Friday with wind chills Friday morning ranging in the thirties to forties below zero. Actual high temperatures for Friday are forecast to range from zero to the teens below zero. An Extreme Cold Watch is in effect for Thursday evening through Friday afternoon.

DISCUSSION

Issued at 136 PM CST Tue Jan 20 2026

Light snow continues to slide southeast through the region this afternoon with the shortwave trough. The next round moves in Wednesday morning, generally following the same track. The big difference will be the winds. Northwest winds will mix down from the 100kt jet with around 55kt at 700 mb and 40 to 50 kts at 850mb. CAA is lacking but there is drier air coming in from the west Wed afternoon with a building sfc high. This air mass should steepen lapse rates, though behind any snowfall. Regardless, winds gusting to 45 mph with fresh snow from today and new snow (up to an inch) on Wednesday will cause blowing snow and reduced visibilities. Issued a Winter Weather Advisory for areas north of I-90 and a wind advisory along I-90. The reduced vsby will likely be in pockets and worse in open areas.

The deep upper trough rotates in on Thursday, digging into the northern Plains and Great Lakes. There is significant thermal packing with H85 temps falling into the -30s Celsius as a 1050s mb high builds in from the northwest. Issued a Cold Weather Watch for Thursday night into Friday morning when wind chills may fall to -35 to -45 degrees. Friday night looks marginally warmer, potentially only meriting a cold advisory. Temperatures will rebound further by Monday when upper ridging begins to transition in from the west. Not in the official forecast as yet, but also can't rule out another light snow event Saturday in between sfc highs.

AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/

Issued at 1126 AM CST Tue Jan 20 2026

Terminals KABR,KATY,KPIR,KMBG

Light snow is sliding southeast through South Dakota this morning. A mix of VFR/MVFR cigs is in place, but vsby will occasionally fall in snow to IFR. The first round of snow ends by this evening with another round moving in Wednesday morning with strong, gusty west to northwest winds.

ABR WATCHES/WARNINGS/ADVISORIES

SD...Winter Weather Advisory from 8 AM to 6 PM CST Wednesday for SDZ006>008-011-018>023.

Extreme Cold Watch from Thursday evening through Friday afternoon for SDZ004>011-016>023-036-037.

Winter Weather Advisory from 6 AM CST /5 AM MST/ to 3 PM CST /2 PM MST/ Wednesday for SDZ003>005-009-010-015>017-033>037- 051.

Wind Advisory from 9 AM to 4 PM CST Wednesday for SDZ045-048.

MN...Winter Weather Advisory from 8 AM to 6 PM CST Wednesday for MNZ039-046.

Extreme Cold Watch from Thursday evening through Friday afternoon for MNZ039-046.