Sioux Falls, SD – A Dense Fog Advisory is in effect today across southeastern South Dakota, southwestern Minnesota, and northwestern Iowa, with conditions expected to create hazardous travel through 10 p.m. Monday.
According to the National Weather Service in Sioux Falls, the lowest visibilities are expected near and east of Interstate 29, especially during the late morning and afternoon hours. Drivers throughout Minnehaha County, Lincoln County, Brookings County, and neighboring areas in Minnesota and Iowa may experience sudden drops in visibility that make travel difficult.
The advisory includes communities such as Sioux Falls, Brookings, Watertown, Luverne, Pipestone, Sheldon, and Storm Lake. NWS forecasters warn that dense fog may reduce visibility to one-quarter mile or less at times, particularly in rural stretches and open areas.
Meteorologists report that the fog developed early Monday due to light winds, ample moisture, and mild temperatures following recent precipitation. Conditions may improve slightly during the afternoon but are expected to redevelop or linger into the evening.
Drivers are urged to slow down, keep headlights on—even after daybreak—and allow additional following distance. The NWS also recommends using the right edge of the roadway for guidance rather than high beams, which can worsen visibility in fog.
No major crashes have been reported as of late Monday morning, but law enforcement agencies across the region have issued similar warnings regarding travel on I-29, I-90, and nearby county roads.
Residents planning evening commutes or school pickups should prepare for longer travel times and reduced visibility, especially in low-lying areas.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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