Enjoy the cooler temperatures, they're gone soon

A bit hazy with high thin clouds in the hour immediately after sunset seems to indicate a more a more moist, hazy transition as the NWS seems to indicate by their forecast of more humidity increasing over the next 24 hours. As I forecasted last night, showers and thunderstorms in the region have prompted the NWS to post flood warnings in Lancaster county---just a outside of what is commonly recognized as the western extent of the Philly area (which is my forecast area). Though the forecast for the potential of showers and thunderstorms in the region was discreetly portrayed by one prominent Philly network, the extremely close proximity of the flood warnings due to drenching downpours that did occur in Lancaster county confirmed that last night’s call for the potential of storms was a necessary one.

The continued chance for showers and thunderstorms will continue through at late Friday night. I am not saying there will be widespread rain and storms but at the least the threat will be lingering. A broad area of low pressure is working its way—slowly—across the Philly Tri-State area with many pockets of energy passing overhead which could touch off a shower or thunderstorm during the period. However the best chance for the strongest, largest storms will form during the day on Friday with the potential hanging around until very early Saturday morning.

By Sunday a more humid southwest wind will develop further aiding the increasing humidity during the progression of the weekend as the low pressure system further distances itself from the region. The chance for isolated thunderstorms are back for Sunday. Monday looks drier ahead of an approaching frontal system that will bring the increased threat of more widespread showers into the area on Tuesday into Wednesday.
Temperatures during this stretch will continue on the lower to average side through Friday night with highs in the low 80’s for Thursday and upper 70’s on Friday. Thursday night’s low will be in the upper 60’s and Friday’s will have mid 60’s. Saturday high will be the low 80’s, with Sunday and Monday in the upper 80’s. Tuesday will be in mid 80’s. Sunday to Tuesday’s lows will be in the low 70’s. Normal temperatures for the Philly region for this period from Wednesday night Aug 13th through Tuesday Aug 19th have highs in the low 80’s and lows in the upper 60’s.