Floodwaters rushed through parts of Alabama and Florida on Wednesday, turning roads to rivers, submerging cars and sending an out-of-control construction barge straight toward a bridge on the Florida Panhandle as Hurricane Sally made landfall and dumped a torrent of rain along its path.

The surging water reached higher than 5 feet in Pensacola, Florida, and slammed a barge into a section of the Pensacola Bay Bridge that was under construction, destroying part of it, Sheriff David Morgan of Escambia County, which includes Pensacola, said in an interview.

Morgan said another construction barge — this one with a “fully extended crane” — also came loose and was heading straight for the Escambia Bay Bridge just before noon. He said he had considered all kinds of ways to stop the barge, even getting permission to fire 40-millimeter grenades at the loose barge before determining that the extreme step would be too dangerous and likely wouldn’t work anyway.

“Right now, we are literally just watching it and waiting for it to happen,” Morgan said of the barge’s expected strike on the bridge. “We just get to watch this thing hit the bridge, how about that.”

The Pensacola area has already seen more than 2 feet of rainfall from Sally, and meteorologists said that up to 35 inches of rain could fall in coastal communities. Morgan said nearly 300 homes in and around the Bristol Park neighborhood of Cantonment, a Pensacola suburb, had been flooded and that residents were having to evacuate.

Sally weakened from a Category 2 hurricane to a Category 1 after making landfall at around 5 a.m. Central Time over Gulf Shores, Alabama, but its deluge was not forecast to let up any time soon as it moved slowly into the Florida Panhandle. Parking lots in both states looked like ponds, and hurricane-force winds continued to pound homes and businesses.

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The languid pace and lurching path of Sally, which was moving northeast at just 5 mph near the Alabama-Florida border as of noon Central Time, led officials to warn residents to hunker down for a sustained period of damage and rainfall.

“Catastrophic and life-threatening flooding ongoing along portions of the north-central Gulf Coast,” the National Hurricane Center warned.

Roughly 150,000 people in Alabama and 200,000 in Florida lost power overnight. With water and downed trees making roads impassible, and with the hurricane’s sustained winds still at 80 mph, residents were told it could be hours before emergency services were dispatched in force.

As the sun began to peek through the clouds, videos from residents and local media outlets showed images of homes that had been ripped apart by the howling winds, boats torn from their moorings and power lines downed in many towns and cities. In Foley, Alabama, just north of the hurricane’s landfall, images showed a destroyed mobile home and a door that appeared to have been yanked by wind from a house.

And everywhere, water.

The extent of the damage was not immediately clear, but videos from Pensacola Beach showed storm surge pushing seawater into residential streets and parks. According to the National Weather Service, a casino barge near Coden, Alabama, broke loose because of strong winds and storm surge and slammed into a dock.

In recent days, the storm’s projected point of landfall has veered by nearly 200 miles. It had once been expected to rake over the remote, low-lying areas of southeastern Louisiana and possibly reach beyond the New Orleans metropolitan area. Instead, it was the more populated areas around Mobile and Pensacola that appeared to bear the brunt of the storm.

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John De Block, a meteorologist with the National Weather Service in Birmingham, Alabama, said the storm was drifting “at the speed of a child in a candy shop,” as if it were meandering through the aisles and waffling over its choices.

Officials urged people to take advantage of the storm’s sluggish pace and get out of harm’s way. Those who stayed behind were warned that the waters could climb high.

“I’ve seen streets and neighborhoods quickly fill up with 5, 6, 7 and even more depth of water in a short period of time,” Sam Cochran, the Mobile County sheriff, said during a briefing Tuesday.

For those who stay behind, he added, it might be “a couple of days or longer before we can get you out.”

Behind Sally, more storms loom in the Atlantic.

Still recovering from Hurricane Laura and now bracing for Hurricane Sally, residents along the Gulf Coast and the Eastern Seaboard warily watched reports of other major storms developing in the Atlantic.

On Monday, before Tropical Depression Rene dissolved, there were five concurrent named storms in the Atlantic, which has not happened since 1971, according to the National Oceanic and Atmospheric Administration.

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Three are still active.

Hurricane Paulette packed winds of 100 mph about 450 miles south of Newfoundland, Canada, and threatened to bring dangerous surf and rip current conditions to Bermuda, the Bahamas and parts of the Atlantic coast.

Tropical Storm Teddy was gaining strength about 865 miles east of the Lesser Antilles, and it was projected to near “major hurricane strength” as it approaches Bermuda over the weekend.

And Tropical Storm Vicky had maximum sustained winds of 50 mph about 710 miles west of Cape Verde, though it was not projected to threaten land and was expected to weaken in the coming days.

This hurricane season has been among the most active on record, with 20 named storms so far. Along with the wildfires that have devastated the West Coast, scientists see the twin crises as yet more effects of climate change, which threatens to reshape the U.S.

Scientists say climate change has made hurricanes wetter, and there is evidence that it can make them slow down, too.