Black ice is a thin, transparent layer of ice on roads that blends seamlessly with the dark pavement, making it nearly invisible until vehicles hit it. In the current Horry and Georgetown County advisory, even 0.12 inches in areas like Aynor can create deadly slick spots on bridges and overpasses.​
Formation Factors
It forms when freezing rain or drizzle hits pavement below 32°F, often overnight or early morning after rain, as roads cool faster than air. Shaded spots, underpasses, and elevated structures like bridges freeze first, matching the inland Lowcountry risks now.
Spotting Techniques
Scan for glossy sheen or “wet-looking” patches amid drier roads, subtle mirages from heat differences, or steam rising from refreezing puddles. Test traction by easing off the gas in suspect areas—sudden slips confirm it; avoid known hotspots during this storm.
Driving Precautions
Stay off roads if possible, per SCEMD; otherwise, reduce speed, double following distance, and skip sudden brakes or turns. If sliding, steer straight, ease off accelerator, and let momentum stop you safely on thawing afternoon pavement.
