The president promised residents of Louisiana and Mississippi: "We're going to stand with you for as long as it takes to recover and allow you to rebuild."
New York residents took to social media to document the historic weather event.
Emergency officials warned "there are no shelters, no electricity, very limited resources for food, gasoline and supplies, and absolutely no medical services."
At least nine people died in New York City and New Jersey due to remnants of Hurricane Ida hitting the region Wednesday evening.
President Biden will travel to New Orleans during the trip, the White House said, but further details about his specific plans are not yet available.
At approximately 2:16 p.m. ET, the National Weather Service in Baltimore-Washington D.C. confirmed that a tornado had touched down in Annapolis, Maryland.
Using specially-equipped aircraft the "Hurricane Hunters" fly into the center of storms, collecting meteorological data for the National Oceanic and Atmospheric Administration.
"They just kept trying to get out, and it was so sad. You can tell they were trying to get out, but they just couldn't," Angel Thomas said.
More than 320 members of the Tennessee Army National Guard traveled to Louisiana "to assist with relief and recovery operations," according to a press release.
The governor said that those who fled to avoid Hurricane Ida should remain where they are until it's safe to return home.
The U.S. Energy Department said that nine Louisiana refineries were forced to close, at least temporarily, due to the storm.
NOLA Ready, New Orleans' emergency preparedness campaign, urged residents who evacuated to not return "until further notice."
Ida, which was downgraded from a Category 4 hurricane to a tropical storm on Monday, is expected to continue losing strength but will remain a dangerous storm system as it moves across much of the Southeast and into the North.
Entergy said in a statement that people in "the hardest-hit areas" could experience outages for up to three weeks, while most customers will be restored sooner.
A generator failure at Thibodaux Regional Health System sent doctors scrambling to keep patients on ventilators in the ICU breathing.
Adoptable dogs and cats from the two states were sent to shelters in California and the east coast ahead of Hurricane Ida.
The Karnofsky family loaned a young Louis Armstrong money for his first cornet, helping to launch his iconic career, according to the National Park Service.
Fuel industry analysts predict an increase in gas prices due to the storm as the country heads into Labor Day weekend.
New Orleans Police Department Chief Shaun Ferguson said he will implement its "anti-looting deployment, to ensure the safety of our citizens and to ensure the safety of our citizens' property."
Early photos and videos show the extreme damage caused by the powerful storm.
Several charities—both national and local to Louisiana—have pledged to help victims with immediate aid and long-term recovery.
Most blackouts are occurring in southeastern Louisiana. In New Orleans, nearly the entire city is still without power, with over 850,000 outages.
Patients from smaller, rural hospitals with particular needs were moved to larger facilities as the storm threatened to damage buildings and knock out power.
"100 percent of the grid is smashed, hundreds of telephone poles snapped, trees hit power lines and just ripped them out," Emergency Management Director Joe Valiente said.
A woman has shared footage from her father's home in Larose, where the roof was torn away by devastating winds.
She was forced to run for cover as debris began raining down on the hospital windows.
Ida hit near Port Fourchon, Louisiana, just before noon local time on Sunday, with maximum sustained winds of 150 miles an hour.
New Orleans Mayor LaToya Cantrell explained why she wasn't issuing a mandatory evacuation order: "It would not work. We don't have the time."
The potential Category 4 storm is expected to hit across much of the state after making its way from Cuba into the Gulf of Mexico this Sunday.
Ida intensified rapidly on Friday from a tropical storm to a hurricane with winds reaching up to 80 mph as it hit western Cuba.