Dense fog advisory in effect for Allendale County until sunrise

Before sunrise, commuters, school bus routes, farmworkers and anyone driving Allendale County’s rural roads faced the worst of a dense fog advisory that reduced visibility to one quarter mile or less and made travel hazardous. The National Weather Service said conditions could change sharply over short distances, turning an otherwise familiar route into a low-visibility drive in minutes.

The National Weather Service office in Columbia updated its hazard page at 7:04:23 a.m. Wednesday and showed active watches, warnings and advisories across the region. Its special weather statement said patchy dense fog had developed across far interior Southeast Georgia into Allendale County, South Carolina, and that localized visibility of 1/4 mile or less could be expected through daybreak. The advisory was set to last until sunrise, with reduced visibility lingering until 8:00 a.m. EDT.

That kind of fog matters more in Allendale County than it would in a more compact place. The county covers 408.1 square miles of land area, but its population was 8,039 in the 2020 Census and an estimated 7,355 on July 1, 2025. With 23.5% of residents age 65 and older, the morning commute affects a large share of older adults who may already be traveling slowly, riding with family or relying on others for medical appointments and errands.

For local families, the key change was simple: plan on more time and less certainty. The fog’s uneven patches meant a clear stretch could disappear quickly on county roads, where traffic, school buses and farm vehicles share limited space. That raised the risk of sudden braking, missed turns and rear-end crashes in the first hours of the day, especially before the sun had time to burn the fog off.

Residents who needed road-impact updates could reach the Allendale County Emergency Preparedness Division, led by Director Kara Troy, at 803-584-4081. With the advisory set to expire by 8 a.m. EDT, the most dangerous window was the pre-dawn and early morning commute, when dense fog had the greatest impact on travel across Allendale County and nearby parts of southeast South Carolina.