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One hundred degrees - the thought alone starts a little trickle of sweat. And the Lowcountry will be on the brink Thursday and Friday.

Whether the thermometer hits triple digits, the blast outside will feel like it. Heat indexes will climb toward the 110-degree mark, which has prompted the National Weather Service to issue a heat advisory for noon-7 p.m. Thursday. Meanwhile, recent breezes have settled to the point where no rip current advisories are in effect. There's a chance of thunderstorms, but not much of one. So there's little relief to be had.

"It looks pretty uncomfortable," said meteorologist Wendy Sellers, with the Weather Service's Charleston office. Officially, the forecast issued Wednesday kept the Thursday and Friday beach and metro area temperatures in the mid to high 90s, but "that doesn't mean there won't be an area or two that might hit 100," she said. "That would be farther inland."

By the weekend, a weather front stirs through to cool some of the heat. Saturday highs are forecast in the low to mid 90s; Sunday in the upper 80s to 90 - closer to normal, Sellers said. Until then, the drill is the same: Slow down, hydrate, stay in the shade or the A/C when possible.

Interestingly enough, despite the tongue-hanging heat of late, the last time Charleston officially reached 100 was at the summer solstice three years ago, on June 21, 2011.

Reach Bo Petersen at 937-5744, @bopete on twitter or Bo Petersen Reporting on Facebook.