Pittsburgh residents can bask in the stability of seasonable temperatures and clear skies for a brief moment before mid-week when a significant shift in the weather pattern is expected, according to the National Weather Service. The high pressure, seasonable temperatures, and dry weather that Pittsburghers are currently enjoying are anticipated to hold strong through Tuesday. However, it's time to look ahead as rain chances and cooler temperatures are projected to take hold by Wednesday, a report from the National Weather Service indicated.
For today's forecast, the focus is on dry weather and seasonable daytime highs, with high pressure creating subsidence that will facilitate another pleasant day. Meanwhile, a pressure gradient may instigate occasional daytime gusts into the 20mph to 30mph range, making for a breezier day than usual. Temperatures tonight are predicted to drop below normal once again, with a freeze likely (>50%) near the Interstate 80 corridor and frost possibilities (>50%) north of Interstate 70, as detailed in the National Weather Service's area forecast discussion.
Looking ahead to Tuesday, the conditions are expected to stay similar with a slight northward movement of the high-pressure system and the low passing to the east, potentially enhancing easterly flow. This could result in occasional daytime gusts into the 25mph to 35mph range, and could see temperatures dipping slightly below average. As nighttime approaches, winds are anticipated to weaken under mostly clear skies, setting the stage for another cool start on Wednesday morning.
However, the long-term forecast from Wednesday through Sunday suggests a departure from these calm patterns. Confidence is high in a longwave trough moving across the central United States by mid-week, leading to a potential cut-off low ejecting from its base. Nearly all ensemble guidance suggests inclement weather conditions, with a wet and windy end to the week in store. Most ensemble guidance brings high temperatures around 10 degrees below average from Wednesday to Friday, according to the report from the National Weather Service. The weather system is expected to pull away by the weekend, but the exact timing remains uncertain—commencing a period of fluctuating patterns in the days that follow.
On the aviation front, VFR conditions should continue for the next 24 hours, providing some respite for those concerned about flight schedules. The area has settled into a dry pattern that will limit cloud development and maintain visibility, with easterly winds gradually veering throughout the day. While it's calm skies for now, travelers should brace for the possibility of weather-related disruptions by late Wednesday as the next system rolls in, bringing with it heightened chances of rain and restrictions.
