Parts of York County have already collected more than 7 inches of rain since Thursday.
And the rainy weather is likely to continue through Saturday, according to a meteorologist at the National Weather Service in State College.
"It could take until tomorrow night or Sunday," John LaCorte said. "It's really a slow-moving system."
As one system moves out of the area, a second storm is on its way to York County from New Jersey, LaCorte said.
York could experience a few hours of dry weather this afternoon.
"I wouldn't count on much more than a couple of hours of dry weather before more rain moves in," LaCorte said.
In terms of additional accumulation, forecasters aren't expecting more than an inch. But, as York County streams begin to overflow, any additional rain "is adding insult to injury," he said.
"If we get some heavier embedded showers, some people could pick up more than that," LaCorte said.
LaCorte said forecasters are not expecting the Susquehanna River to swell beyond its banks.