The National Weather Service warned Thursday that afternoon and evening thunderstorms could dump 2 to 3 inches of rain in an hour as they plod across the Triangle.
“Slow-moving scattered thunderstorms with torrential downpours will cross central North Carolina this afternoon and this evening. In the heaviest downpours, 2 to 3 inches of rain will fall in an hour, leading to minor flooding – especially of streets and underpasses,” forecasters said in posting a hazardous-weather notice.
Some of the thunderstorms could also be severe, the weather service said, a category that can bring winds strong enough to damage trees or structures.
Outside the heavy rain areas, forecasters said there was about a 50-50 chance of getting up to a quarter-inch of water.
There was a 30 percent to 40 percent chance of light rain overnight, and Friday looked to be partly sunny with highs in the upper 80s, the weather service said.
The weekend forecast was for mostly sunny conditions, with highs in the upper 80s and overnight lows in the upper 60s.