Posted: August 13, 2012
The return of warmer, more humid air will be accompanied by thickening clouds on Tuesday with showers in western Pennsylvania migrating to eastern Pennsylvania as the day progresses. Rainfall will be light to moderate (0.10-0.60”), though a few spots could receive an inch of rain. The showers will move away from the eastern counties on Wednesday morning, but clouds will linger in some sections into the afternoon. Temperatures will be near or below seasonal levels. Warmer air will return along with sunshine on Thursday and part of Friday until a stronger cold front arrives at the start of the weekend. Odds favor the front slowing down as it crosses the state causing some additional rain in the eastern counties on Saturday (morning). The coolest air mass in several months will overspread the region next weekend with afternoon clouds in the hilly terrain and nighttime temperatures dropping into the 30’s in the cool pockets of the north, the 40’s in the rural valleys of the central sections and the 50’s elsewhere. Daytime readings will also be below average on either Saturday and/or Sunday. A slow, but pronounced warming trend will start next Monday (Aug 20th) and continue for a few days. It appears that a weakening cold front around August 22-23 will interrupt this warming trend with more clouds and showers. We still anticipate a few days of heat by the end of August. The Tropics will come to life again around Labor Day.
- Pennsylvania State Climatologist