Pittsburgh, Pennsylvania — A rare May cold snap will spread across Pennsylvania beginning Friday, May 8, bringing freezing overnight temperatures, gusty winds, and even light snow in some areas, creating travel and safety concerns across Pittsburgh, Philadelphia, Harrisburg, Erie, and State College.
According to NOAA’s Climate Prediction Center, temperatures will run 50–60% below normal through May 14, with the coldest air arriving Friday night into early Saturday. The most critical window is from 1 a.m. to 8 a.m. Saturday, when temperatures are expected to fall to or below 32 degrees across much of the state.
That cold will quickly create real-world impacts. Frost is likely to form on bridges and overpasses along I-76, I-80, and I-81, leading to slick spots for early morning drivers. In western and northern areas, including Erie and State College, brief snow flurries are possible, which could reduce visibility and lightly coat grassy surfaces and untreated roads.
Rain moving in Friday night will compound the risk, creating wet roads and rapid pooling in low-lying areas. Flood-prone underpasses in Pittsburgh and drainage areas near the Susquehanna River in Harrisburg could see water buildup within minutes during heavier showers.
Winds will increase Saturday into Sunday, with gusts reaching 35 to 40 mph. Those winds may bring down small branches and trigger isolated power outages, especially in wooded and elevated areas.
Drivers should slow down on wet or slick roads, particularly before sunrise, and avoid water-covered roadways. Residents should cover sensitive plants and secure loose outdoor items ahead of the wind.
The highest risk for freezing temperatures, flurries, and hazardous travel conditions peaks early Saturday between 1 a.m. and 8 a.m.
