An interesting pattern change starts setting up over the weekend, as an amplified jet stream trough begins to develop over the Great Lakes and weak disturbances begin to rotate through our area as a cold front slowly advances.  This amplified pattern is something we usually start seeing late August, not July, but it’s been a somewhat consistent feature of our cooler weather this entire year.

This amplified trough will eventually bring cooler temps and lower humidity to our area next week.

Saturday looks like the best day, although some clouds and showers may move in during the late afternoon. The approaching upper disturbances are more likely to bring showers and clouds Sunday. Details still uncertain.

High pressure is drifting off to the northeast and an easterly surface wind flow will bring moisture and cloudiness to the Philadelphia area over the weekend. Areas to our east and the Jersey shore will have more clouds and areas to the west will have brighter skies. The models often have a tough time predicting the amount of cloudiness in the summer, so confidence in this forecast is a bit lower than past weeks.

No precipitation is expected.

Sat 7/19: Cloudy in the morning, some brightening skies during the afternoon. High 83.

Sun 7/20: Cloudy in the morning, some sun possible in the afternoon. High 82.