Pennsylvania Summer Weather Alert: Heat Index to Hit 100° Friday — Storms May Snarl I-376 Near Pittsburgh

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Pittsburgh, PA – Dangerous heat and sudden afternoon storms could bring flash flooding and damaging winds across western Pennsylvania by midday Friday.

According to the National Weather Service, a Heat Advisory remains in effect until 8 p.m. Friday, with heat indices reaching 100° between noon and 6 p.m. The greatest risk spans Allegheny, Washington, Beaver, and surrounding counties. Scattered thunderstorms may develop by late morning and intensify throughout the afternoon.

Drivers along I-376, Route 28, and I-79 should expect slowdowns, ponding, and possible lane closures due to heavy rainfall and wind gusts. Localized flash flooding could occur quickly during downpours, especially in low-lying or poor drainage areas.

Outdoor events and strenuous activities should be avoided during peak heat hours. The NWS advises staying in air-conditioned spaces, hydrating frequently, and checking on vulnerable neighbors.

On Saturday, another round of thunderstorms is likely after 2 p.m. with highs around 88°. Storms continue Saturday night into Sunday morning before gradually clearing out. Sunday will be hot, sunny, and near 89°—a brief break before rain returns Monday.


🔸 5-DAY PITTSBURGH AREA FORECAST (June 26–July 1)

  • Thursday: High 93°, chance of storms after 11 a.m.
  • Friday: High 91°, heat index up to 100°, storms likely from noon–6 p.m.
  • Saturday: High 88°, storms mainly after 2 p.m.
  • Sunday: High 89°, partly cloudy and warm
  • Monday: High 92°, storms likely in the afternoon and evening

Stay alert for updated watches and warnings into the weekend.