The Boston Pops annual July 4th concert and fireworks show attended by thousands is being moved up a day because of potential heavy rains ahead of Tropical Storm Arthur.

Organizers and public safety officials said Wednesday afternoon the celebration is being rescheduled to what appears to be the best of two potential bad weather days. Arthur is expected to pass well east of New England over the weekend.

State Police Col. Timothy Alben said security arrangements are ready to go, since the public rehearsal would have been held Thursday night anyway. He said the performance could be also cancelled Thursday if the weather isn't safe.

The performance takes place in the Hatch Shell along the Charles River Esplanade, with fireworks set off from barges on the river.

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