textproduct: Aberdeen

KEY MESSAGES

- Dense fog has developed over portions of central and northeastern SD and will stick around through the morning. Additionally, temperatures below freezing will cause freezing fog at times. Visibilities less than one mile and light icing could create hazardous driving conditions.

- Temperatures Saturday through next Tuesday will warm up to 10 to 20 degrees above normal for early November, with highs in the 50s to 60s.

DISCUSSION

Issued at 108 AM CST Fri Nov 6 2026

Low clouds have been moving in over areas east of the Missouri River and over northeastern SD, with fog developing both under and outside of the low cloud coverage. With high surface pressure over central and northeastern SD through the afternoon causing the winds to be light, this fog will be sticking around into the late morning/early afternoon. A dense fog advisory has been issued as the fog will be dense and visibilities could be less than a mile at times in these areas. Another concern with the fog is that the temperatures will be dropping below freezing in areas with the fog, creating freezing fog. Some model soundings keep the temperatures under the low clouds from dropping below freezing, while other models have the temperatures drop down. Take caution when traveling this morning as the lower visibilities from the fog and the potential for slick surfaces from freezing fog could create slightly hazardous travel conditions through the morning. The fog and low clouds will help to keep the temperatures from rising to much during the day, so they will be around normal in the low 40s to low 50s.

The lower clouds and fog will be building back in this evening into Saturday morning over central and northeastern SD. The low temperatures look to be below freezing again, which could create areas of freezing fog into Saturday morning. This fog is forecast to mix out during the morning and temperatures will be warming up. High temperatures are forecast to warm 10 to 20 degrees warmer than normal with these above normal temperatures continuing into the beginning of the work week. Despite a few frontal boundaries and surface troughs moving through central and northeastern SD this weekend, drier air aloft through the beginning of the work week will help to keep precipitation from developing.

A small upper level shortwave will be moving to the north of SD Saturday into Sunday, which will help to move a low surface pressure over Canada to the east. The low surface pressure tightens the pressure gradient over northern SD Saturday that will create some stronger winds aloft over northern SD Saturday. The model ensembles have a 30-50% chance for winds to gust up to and over 30 mph early Saturday afternoon over north central SD and portions of northeastern SD north of HWY 212. The models have backed off slightly on the winds, as they only have a 10-20% chance for gusts up to 35 mph over north central compared to the lower chances for up to 40 mph in earlier runs. Minimum relative humidity in the afternoon will be between 35-55% in these areas, which helps to keep the fire weather concerns from increasing too much. The grassland fire danger index values for north central and northern portions of northeastern SD will be mostly be moderate with portions of western Corson county getting into the high category.

AVIATION /06Z TAFS THROUGH 06Z SATURDAY/

Issued at 1053 PM CST Thu Nov 5 2026

Terminals KABR,KATY,KPIR,KMBG

An area of MVFR CIGS remains at KABR/KATY...with those CIGS most probably lowering to IFR in the next few hours. While it remains VFR for KMBG/KPIR, these conditions are likewise not expected to last for much longer with lower CIGS and/or lower VISBY due to fog. These conditions will improve during the late afternoon but are expected to return late in the TAF period.

ABR WATCHES/WARNINGS/ADVISORIES

SD...Dense Fog Advisory until 10 AM CST /9 AM MST/ this morning for SDZ003>005-009-010-015>017-033>037-045-048-051. MN...None.