This system will be different than a typical winter weather event.
COLUMBIA, S.C. — A weekend winter storm is still on track to bring several inches of snow to central South Carolina, and new forecast updates suggest the impacts will stretch from Saturday’s snowfall into days of dangerous cold that follow.
News19 has issued a Weather Impact Alert for Saturday, Sunday and Monday. Saturday is focused on accumulating snow, while Sunday and Monday are expected to bring bitterly cold temperatures and continued hazardous road conditions.
A Winter Storm Watch remains in effect statewide from Friday night through early Sunday, and an Extreme Cold Watch covers the period after the snow ends as Arctic air pours into the region.
Meteorologists say this setup is unusual for South Carolina because cold air will already be firmly in place before most of the precipitation arrives. That allows the vast majority of what falls to be snow instead of a messy mix.
Forecast guidance indicates about 95% or more of the precipitation during the main part of the storm should fall as snow, with little to no ice expected.
The air mass is also very dry, producing light, powdery snow rather than heavy, wet snow. That matters for two reasons: it is easier for the wind to blow around, creating drifts and covering treated roads, and it can accumulate to higher depths from the same amount of moisture.
Forecasters note that if this were wetter snow, totals might be only a few inches. Because it is powdery, those same conditions can yield noticeably higher accumulations.
Friday stays dry, with clouds increasing late in the day.
Snow is expected to begin after midnight Friday night into early Saturday morning, roughly between 1 and 3 a.m. Light to moderate snow then continues through the day Saturday, with darker, heavier bands at times that can quickly boost totals.
The snow should come to an end early Sunday morning, although impacts will last longer.
Breezy conditions during the storm will allow that powdery snow to blow and drift, potentially re-covering roads that have already been treated.
Probability guidance from the National Weather Service shows very high confidence in accumulating snow across the Midlands.
Latest model agreement has tightened considerably compared to earlier, more uncertain forecasts.
Across the Midlands, most guidance now points to 4 to 6 inches of snow, with slightly higher amounts possible farther north and northeast and lower totals toward the southern and western Midlands.
A statewide view shows a sharp gradient:
Because the snow is expected to be light and fluffy, even modest wind will be able to move it around, leading to localized drifts and uneven totals.
As the snow exits early Sunday, the second phase of the impact begins: extreme cold.
Morning lows are forecast to drop to around 13 degrees Sunday and again Monday. With wind gusts, Sunday morning wind chills are expected to fall deep into the single digits, and some spots could briefly feel below zero.
Expected morning low temperatures:
That combination of snow on the ground and prolonged below-freezing temperatures means melting will be very limited. Even where the sun comes out, icy and slick spots are likely to persist into Monday and possibly Tuesday.
By Tuesday morning, lows are still expected in the lower 20s, and even daytime highs through much of the coming week remain well below normal.
Hazardous travel is likely to develop Saturday and could continue for several days due to blowing snow, drifting, and refreezing.
The extreme cold also raises the risk of cold-related injuries. Forecasters urge residents to bundle up in layers if heading outside and to be prepared for prolonged freezing conditions.
With temperatures staying below freezing for long stretches, dripping faucets can help reduce the risk of frozen pipes.
Forecasters warn that hypothermia and frostbite become real risks in this kind of cold, especially with wind chills near or below zero.
Residents are urged to dress in layers, limit time outdoors, drip faucets to help prevent frozen pipes, and use caution traveling even after the snowfall ends.