Pittsburgh, Pa. – Intense summer storms are set to rattle Pittsburgh Wednesday, with commuters and families urged to brace for scattered thunderstorms and dangerous heat by noon. Lightning, downpours, and steamy highs near 89°F threaten to snarl traffic along I-376 and I-279, disrupt outdoor plans, and create flash flooding in low-lying neighborhoods.
According to the National Weather Service, the most active weather moves in after 9 a.m. Wednesday, as a wave of thunderstorms develops over Allegheny County. Scattered storms may persist into the evening, with rainfall rates high enough to cause ponding on busy streets and along major highways. Afternoon humidity will push the heat index even higher, making it critical for residents to stay hydrated, seek shade, and avoid strenuous activity outdoors.
By Wednesday night, the storm threat lingers—patchy fog and more scattered showers could reduce visibility for late drivers and anyone traveling near the rivers or through wooded neighborhoods. Heading into Thursday, isolated thunderstorms may redevelop after 11 a.m., while Friday is set to bring more sunshine but continued chances for pop-up storms as highs climb to 88°F.
Five-Day Forecast Highlights:
- Wednesday [89°F]: Scattered thunderstorms from late morning through evening, locally heavy rain, humid.
- Thursday [87°F]: Isolated storms possible, partly sunny, patchy fog early, muggy.
- Friday [88°F]: Partly sunny, scattered afternoon thunderstorms, summer heat.
- Saturday [90°F]: Mostly sunny, risk of storms late afternoon, high humidity.
- Sunday [89°F]: Showers and thunderstorms likely, especially by afternoon, warm and unsettled.
