A cold front will move into the region on Sunday and this will bring an end to the hot temperatures across our region. If we see a decent amount of sunshine before the arrival of clouds and thunderstorms, temperatures could reach into the upper eighties away from the ocean and mountains.
Thunderstorms will be associated with the frontal passage during the afternoon and evening hours. Some severe weather is possible, especially in areas where the thunderstorm arrival coincides with the peak of daytime heating. This is most likely near Lancaster, Reading, Allentown, and Mount Pocono as thunderstorms look to definitely impact these areas before sunset. However, as the evening progresses, it appears at least some severe weather is possible all the way to the coastline after dark, but probably not as widespread with the loss of daytime heating. There is still sometime for the frontal passage to speed up and if that occurs…severe weather chances may increase throughout the entire region. Any thunderstorm may contain heavy rainfall and frequent cloud to ground lightning. As of today, the Storm Prediction Center has most of our region in a slight risk category for severe weather.
Monday is a day of transition as the front slowly pushes offshore. It will be cooler, but there still will be some lingering instability and moisture to work with. So a shower or a thunderstorm is still possible.
Tuesday through Thursday looks to be a tranquil period with plenty of sunshine and low humidity as the jet stream pushes south allowing for a cooler flow of air. Based on the latest model runs, showers are possible Friday...but more likely during the weekend.