The largest city in Texas is facing what some meteorologists say is the worst flooding they have ever seen, as Harvey continues to barrel down the state’s southeast coast Sunday morning.

The National Weather Service has warned of “catastrophic” and potentially “historic” flooding in the Houston metropolitan area. Nearly two feet of rain had dropped on the city by early Sunday, with up to 15 to 25 additional inches expected.

Dramatic images shared on social media show vehicles, trees and traffic lights partially submerged, and parks buried in mud-colored water. Floodwaters continue to flow through residential streets, as well as more than 200 roads and highways.

Interstate 610 is desolate, and portions of it are completely underwater. This photo taken by Reuters shows one abandoned vehicle partially submerged:

Here’s part of I-610 from a traffic camera:

And here’s what Buffalo Bayou Park, a 124-acre green space just outside downtown Houston, looks like:

In at least one parking lot, the water was high enough for kayaking:

In at least one newsroom, reporters working Sunday had to move because water had seeped in:

A facility of the Houston Police Department is also flooded:

More than 1,000 water rescues had been reported as of Sunday morning. Drivers are abandoning their cars.

Harvey drops nearly two feet of rain on Houston, causing catastrophic flooding

Two kayakers try to beat the current pushing them down an overflowing Brays Bayou along S. Braeswood in Houston, Texas, Sunday, Aug. 27, 2017. Rescuers answered hundreds of calls for help Sunday as floodwaters from the remnants of Hurricane Harvey climbed high enough to begin filling second-story homes, and authorities urged stranded families to seek refuge on their rooftops. (Mark Mulligan/Houston Chronicle via AP)