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Charlotte has had some rain every day since Saturday, and nearly an inch fell in a sudden storm Monday. Both conventions have been plagued with rain. More than three inches fell in Tampa while delegates were there last week for the Republican gathering.

A downpour likely wouldn’t be enough to bother Obama’s speech, but the main worry is lightning. The storms possible Thursday night are ones typical for the South in late summer. They can pop up quickly and move slowly.

“The main concern would be any lightning near the stadium,” said Jeffrey Taylor, a meteorologist with the National Weather Service.

For football games at the stadium, officials urge fans to go into the concourses when there is a threat of lightning.

Obama has given memorable speeches in the rain before. In October 2008, he got soaked speaking in the suburbs of Philadelphia while Republican rival John McCain canceled his remarks a short distance away.

Obama praised the crowd of 9,000 people for braving the bone-chilling rain and wind, saying that kind of dedication would win him the presidency.

“If we see this kind of dedication on Election Day, there is no way that we’re not going to bring change to America,” he said.

In July, Obama spoke to about 900 people during a campaign stop in Virginia, turning down an umbrella or a raincoat. He apologized to the women in the crowd for ruining their hair.

“We’re gonna have to treat everybody to a salon visit after this” he quipped.

Associated Press writers Gary D. Robertson in Charlotte and Ben Feller in Norfolk, Va., contributed to this report.