Houston Mayor Sylvester Turner told “Good Morning America” Saturday that his city is still facing considerable danger from Hurricane Harvey, even though it weakened after moving inland.

“This is still going to be a major rain event for the City of Houston and Harris County,” he said. “This is just day one. We’re anticipating a lot of rain over the next four or five days. We anticipate there will be flooding.”

He also addressed concerns that he and Texas Gov. Greg Abbott had sent conflicting messages about what was safer: fleeing or staying in place.

“The governor and I both agree that this is a serious and unprecedented storm,” Turner said. “For Houston, Harris County, the county judge and I both agreed that for us this was a major rainfall event and so there was no need to evacuate. We are asking people to stay off the street … Quite frankly, leaving your homes, getting on the streets, you’ll be putting yourself in more danger and not making yourself safer.”

Several storm chasers have been on the ground in Rockport, Tex., a city on the southeast coast of the state about 30 miles from Corpus Christi. And their images from the area show severe damage from Hurricane Harvey, including destroyed hangars at the Aransas County Airport and completely collapsed buildings along the water.

Sitting in a car atop a bridge — the only place he could receive cell service — Jeff Piotrowski said in a Periscope broadcast that he witnessed “moderate to major, in some areas catastrophic” damage in Rockport and the nearby town of Fulton.

“We’re leaving town,” Piotrowski said in the broadcast, alongside fellow storm chasers Mike Theiss and Reed Timmer. “It’s a mega-disaster here.”

Timmer tweeted that the worst Harvey-related damage he had seen was at Holiday Beach, Tex., just north of the bridge from Rockport.

With Hurricane Harvey stalling not far from Victoria, Tex., rainfall totals are rapidly increasing. Nearly 15 inches had fallen in some areas through 10 a.m. central.

Here are some select totals:

Flash flood watches and warnings plastered the entire area between Corpus Christi and Houston and several counties inland.

At 11:40 a.m. (10:40 a.m. central), radar showed the core of Harvey and its heavy rain centered near Victoria, but a very intense spiral band of the storm extended from near Galveston northwestward through the north side of Houston.

The National Hurricane Center’s 11 a.m. report said Harvey was still holding onto hurricane status, with peak winds of 75 mph. Importantly, its forward motion had essentially stopped. The storm is presently drifting to the north at a mere 2 mph. This means torrential rain is set to drench many of the same locations for hours and days and the feared flood catastrophe may be about to begin.

Harvey may be reclassified as a tropical storm this afternoon, but the most dangerous chapter of this storm is only beginning. Keep up with the latest reports and forecasts at Capital Weather Gang.