With the anniversary of Hurricane Katrina looming, people in several Gulf state are once again facing a serious threat.

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Tropical Storm Isaac, blamed for more than 20 deaths in the Caribbean, churns in the Gulf of Mexico and is on an uncertain path toward Mississippi and Louisiana.

Public officials are warning those located near the potential impact zone.

"If your plan for an event like this was to leave, now is the time to leave," said New Orleans Mayor Mitch Landrieu.

Isaac is expected to make landfall as a Category 1 or Category 2 hurricane late Tuesday into early Wednesday.

Wednesday marks the 7th anniversary of Hurricane Katrina, the costliest storm in U.S. history.

Isaac could pack a series of life-threatening blows, including high winds, a storm surge and widespread flooding.

New Mexico resident Pat Avalos has stocked up on supplies for her son who just bought a home in New Orleans.

"We're not from here. We're from New Mexico, so I'm nervous, very nervous," Avalos.

Here in the D.C. area, Red Cross volunteers are heading to Louisiana to help.

Bill Pritchard, a Red Cross volunteer, first worked for the organization in the wake of Hurricane Katrina.

"We hope it isn't going to be as tough as it was for folks then," Pritchard said.

Dominion Virginia Power is sending 130 workers and contractors to the Gulf Coast in bucket trucks to help with any necessary power restoration efforts. The company is returning a favor, as crews from Louisiana came to Virginia after the June derecho.