PITTSBURGH — Pennsylvania was blanketed with thunderstorm and flood advisories as storms doused the state Friday and contributed to the weather woes of its central region already soaked from flooding the previous day.

As the rains moved across southwestern Pennsylvania, a creek flooded in Washington, and a tree blew into a moving vehicle in nearby Somerset Township, the National Weather Service reported Friday.

The agency issued thunderstorm watches or warnings for the entire southern half of the state, most scheduled into the night. Flood warnings and watches were issued for several northern and central sections of the state, where storms hit hardest Thursday and tornadoes touched down both in Centre and Perry counties.

Northwestern counties near Erie, northeastern counties near Scranton and the central counties of Jefferson and Clearfield were considered the most susceptible to flooding.

With major bills in limbo and less than three days left in the legislative session, the state’s top leaders flew to north central Pennsylvania to survey the damage.

The Pennsylvania National Guard’s Black Hawk helicopter took Gov. Tom Corbett, House Speaker Sam Smith and Senate President Pro Tempore Joe Scarnati over damaged areas. They included Jefferson County, where Smith and Scarnati live, and Clearfield and Clinton counties.

On the ground, Corbett visited with residents whose homes flooded and said he saw workers clearing out a flooded supermarket. What struck him, he said at a news conference in DuBois, one of the hardest-hit towns, was “the suddenness of the storm and the volume of water that came on in such a short period of time.”

Jefferson County Emergency Services Director Tracy Zents said Clearfield and Jefferson counties declared disaster emergencies, while the Pennsylvania Emergency Management Agency was collecting damage reports to see if the region qualified for federal aid.

“We’ll add them all up and see if we meet the number to get some help from the federal government,” said Glenn Cannon, head of the state emergency management agency, who toured the area with Corbett.