An Extreme Heat Warning has been extended through Saturday evening across most of Western Pennsylvania as a major heat wave continues to bring dangerously high humidity and soaring temperatures to the region during the Independence Day holiday weekend.
The National Weather Service extended the warning until 8 p. m.
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Saturday for several counties, including Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette, Lawrence, Indiana, Greene, Washington, Westmoreland, and Venango, as well as Monongalia County in West Virginia.
A separate Heat Advisory remains active until 10 p. m.
on Friday for the Laurel Highlands, covering parts of Indiana, Westmoreland, Fayette, Monongalia, and Preston counties.
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Heat index values are projected to climb between 100 and 110 degrees Fahrenheit in multiple locations due to the combination of high temperatures and intense moisture levels.
Storms Could Disrupt Fireworks
Forecasters stated that the regional heat dome is beginning to break down, creating an active corridor for scattered showers and severe thunderstorms to develop on both Friday and Saturday.
While daytime holiday events and parades are expected to remain dry, the timing of the late-day storms could disrupt scheduled evening fireworks displays, particularly around downtown Pittsburgh, where simulated radar tracking shows localized storm activity intensifying after dark.
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The region will see a transition to cooler conditions early next week as a noticeable drop in humidity brings temperatures back down into the mid-to-upper 80s, though lingering storm risks remain in the extended forecast.
