As the lingering upper low continues to shape Pittsburgh's weather, residents should brace for another cool day with scattered showers, particularly to the northeast of the city. According to the latest update from the National Weather Service, temperatures are expected to stay 10 to 15 degrees below average, with shower chances diminishing by Saturday.
The forecast indicates that while the city may experience some clearing, opportunities for valley fog patches are possible late into the night. Despite the cool down, frost advisories seem unnecessary, with only isolated pockets potentially seeing temperatures dip low enough to cause frost. Keeping a low profile, destabilized air will be maintained, and showers in store for today will continue, particularly downstream of Erie's lake fetch.
Looking ahead to the weekend, Saturday promises fewer showers as drier air enters the area, and any lingering precipitation is expected to be confined to the I-80 corridor and higher elevations. Meanwhile, Sunday is set to bring a brief reprieve, with a slight temperature increase and dry conditions, although there is a small chance for showers late in the day. According to the same weather report, there is high confidence that temperatures will remain cool regardless of Sunday's outcomes.
Memorial Day is becoming more seasonable, with temperatures nearing normal and low rain chances. The larger weather pattern, however, remains uncertain heading into the following week, with the potential for more rainfall on Tuesday. Depending on the development of an upstream trough, temperatures could vary significantly as the week progresses. "Late week highs could be anywhere from the upper 60s to low 80s," stated the National Weather Service.
Regarding aviation, the next few days up to Tuesday look clear of significant ceiling or visibility restrictions, with Pittsburgh area airports primarily experiencing MVFR to VFR conditions. Pilots should anticipate the potential for IFR conditions in places like BVI and DUJ, improving during the day. Rain might come back by Tuesday night, possibly bringing visibility restrictions. No watches, warnings, or advisories are in effect for PA, OH, or WV, as per the National Weather Service.
