Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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090 FXUS63 KABR 292312 AFDABR Area Forecast Discussion National Weather Service Aberdeen SD 612 PM CDT Tue Sep 29 2026 .KEY MESSAGES... - Patchy to areas of fog will develop overnight, with visibility down to around 2 miles or less mainly east of the James River. - High temperatures Thursday and Friday will be 5 to 8 degrees below normal for this time of year. - There is a 20-40% chance of light rain Saturday, mainly east of the MO River. && .DISCUSSION... Issued at 243 PM CDT Tue Sep 29 2026 Slightly drier air is slowly working into the area behind a cold front set up across our eastern counties at 19Z. Lingering light rain has all but ended over our far eastern counties. Instead of RH value sin the 80+ percent range, they are down into the 60-70% ranges over north central SD west of the MO River this afternoon. Light winds and lingering moisture overnight will result in fog potentially developing, particularly over east central SD. There is some uncertainty, but if fog does develop it will be dense with headlines likely needed for a few counties. The ECMWF ENS visibility meteogram page shows a 30% chance of visibility of 0.2 miles or less at Watertown. Northwest of Watertown shows less of a chance of fog developing. An additional low over northern Alberta Canada will cross into central Canada and drag a cold front along the ND/SD border Wednesday morning/early afternoon. This boundary will continue to sink southeast across the forecast area Wednesday afternoon/evening. This will bring a temperature change down to slightly below normal temperatures for highs starting Thursday. High temperatures Thursday and Friday will be 5 to 8 degrees below normal for this time of year. There is also a 30% chance of showers over central SD Thursday night. Dry weather will again quickly take hold.There is a 20-40% chance of light rain Saturday, mainly east of the MO River. && .AVIATION /00Z TAFS THROUGH 00Z THURSDAY/... Issued at 611 PM CDT Tue Sep 29 2026 Terminals KABR,KATY,KPIR,KMBG VFR conditions for KPIR/KMBG. Could be some MVFR fog for KABR and likely MVFR to IFR fog for KATY overnight into Wednesday morning. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ DISCUSSION...06 AVIATION...07