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A loud booming sound was reported Tuesday morning along Charleston County's coast, and the National Weather Service says it was most likely caused by a sonic boom.

The weather service started receiving reports of the boom and shaking around 8 a.m. A James Island resident wrote on Facebook that the boom shook her house. A man said he heard it in West Ashley.

The United States Geological Survey has not reported an earthquake in the area.

"At this point, we're pretty confident it's not an earthquake," said Carl Barnes, a meteorologist with the weather service. "Unfortunately, we really can't say with any confidence what it was. ... If it is military testing, which is certainly a possibility, they don't let us know."

Otherwise, Tuesday in Charleston started off with cool temperatures, but more comfortable weather is ahead. The high is expected to be near 69 with sunny skies.

Wednesday should bring more of the same weather, according to the National Weather Service. Then daytime temperatures will drop to 65 before they climb back up to a high of 74 on Friday.

Tonight: Partly cloudy, with a low around 50.

Wednesday: Partly sunny, with a high near 71.

Wednesday night: Mostly clear, with a low around 50.

Thursday: Sunny, with a high near 65.

Thursday night: Mostly clear, with a low around 50.

Friday: Sunny, with a high near 74.

Friday night: Partly cloudy, with a low around 54.

Saturday: Mostly sunny, with a high near 64.

Saturday night: Mostly clear, with a low around 46.

Sunday: Sunny, with a high near 64.

Sunday night: Partly cloudy, with a low around 49.

Monday: Partly sunny, with a high near 69.