The coldest air of the season has arrived in the Palmetto State -- and some frost is likely in many areas away from the coast early Tuesday morning.
The National Weather Service has issued Frost Advisories over much of the state beginning after midnight Tuesday and lasting until mid-morning Tuesday. Temperatures are forecast to drop to between 32 and 37 degrees in most areas. Locations primarily to the east of U.S. Highway 17, closer to the coast, will likely see temperatures hold in the upper 30s or in the 40s. As a result, those areas are expected to see little, if any frost.
Gusty winds from the north were supplying a fresh shot of chilly air into South Carolina Monday. As an area of high pressure approaches the state early Tuesday morning, winds will diminish. Light winds under clear skies often favor chilly temperatures in early November. In this case, the temperatures are likely to be cold enough for frost and/or a freeze in the areas under warnings and advisories.
The average date of the first freeze in much of the Midlands and Upstate is during the first week of November; however, air temperatures (measured about 6 feet above ground) do not have to fall to freezing in order for frost to form.
The area of high pressure is forecast to move into the Atlantic Ocean during the day Tuesday. Warmer air on the back side of the high pressure will result in moderating temperatures and a much lower chance of frost Wednesday morning.