Our sultry South Carolina summer is starting off with a scorcher in the forecast.

The National Weather Service has issued a heat advisory in effect from noon today until 7 p.m.

The advisory is for the southern portions of South Carolina and southeast Georgia and includes counties east of Interstate 95.

Heat index values were expected to be as high as 107 degrees, the Weather Service said.

The forecast calls for a partly sunny day, with isolated showers and thunderstorms.

Highs will be in the upper 90s, except in the lower 90s near the coast. Winds will be from the southwest around 10 to 15 mph. The chance of rain today is 20 percent.

Where no thunderstorms occur, maximum heat index values will persist for at least three to six hours this afternoon and early evening. Where thunderstorms do occur, heat index values will decrease rapidly, the Weather Service advisory said.

Tonight should be mostly cloudy with a slight chance of showers and thunderstorms. Lows will be in the mid 70s, with south winds 5 to 10 mph, becoming west after midnight. The chance of rain tonight is 20 percent.

Sunday is forecast to be partly sunny with a chance of showers and thunderstorms and highs in the upper 80s. Winds will be from the northwest around 5 mph, becoming northeast in the afternoon. The chance of rain Sunday is 40 percent.

Sunday night will be mostly cloudy with a chance of showers and thunderstorms. Lows in the mid 70s. East winds 5 to 10 mph. Chance of rain 40 percent.

High temperatures and high humidity could lead to heat illness if proper precautions are not taken, the advisory said.

If you must be outdoors, drink plenty of fluids, wear lightweight clothing and stay out of the direct sun. Take extra breaks from work. Never leave children or pets in a vehicle.