The skies over Pittsburgh may carry the threat of Independence Day interruptions with scattered thunderstorms expected throughout the area. These storms bring a low probability of localized flash flooding and gusty wind, according to the National Weather Service.
Those residing along and south of the I-70 corridor should particularly note the forecast, as storms are likely to arise this afternoon and evening. Every picnic and parade might not be a washout today but, "remain weather-aware," as detailed by the National Weather Services. The northern part of the I-70 may see drier conditions, though a stray shower or thunderstorm is still possible.
With the Southeast harboring a broad surface high pressure and the East Coast under an upper ridge, the warm, humid weather is expected to persist, with temperatures in the mid-70s during the early hours. For the South of I-70, modest instability and weak forcing limit the severe weather risks, but concerns persist due to the potential for storm training along the surface boundary.
Tonight, following local firework displays—which are likely to go off without a hitch (apart from those fired by the ubiquitous neighborhood enthusiast)—shower and thunderstorm coverage is expected to increase. Moving into Friday, the weather pattern changes slightly with a shortwave and surface low-pressure system that could cause more extensive storm activity. Damaging wind and flash flood threats remain possible, according to the National Weather Service.
Fortunately for those with weekend plans, dry and seasonable weather is slated to return by Saturday. The National Weather Service Pittsburgh PA also projects a high probability for continued pleasant weather through Sunday, before unsettled conditions potentially resume by mid-week due to an approaching low-pressure system.
In terms of air travel, conditions have been somewhat tumultuous with terminals south of Pittsburgh experiencing substantial rainfall, potentially leading to MVFR/IFR ceilings through the dawn. Convection is predicted to weaken past midnight, and by Sunday, VFR weather should prevail under high pressure.
