In the wake of this weekend's disturbances leaving us behind on Monday, relatively high levels of humidity should remain in place as dew points hang in the upper half of the 60's to near 70 degrees. This, combined with temperatures that could reach as high of 95 or so between Monday and Wednesday, brings the potential for heat index values near or above 100 degrees over the course of those three days. The National Weather Service has an Excessive Heat Watch out for the Delaware Valley for Monday through Wednesday because of the potential for higher heat index values due to the return of some substantive heat early next week.
There are no indications of 100 degree temperatures over the course of the three days; highs likely get to around 95 degrees or so. That said, the potential of heat and humidity could result in heat indexes (what it feels like) getting near or over 100. Not as dangerous as the last real bout of heat we dealt with over the week of the 4th of July but definitely a substantive heat wave in the offing for the region.
The heat will subside a bit after a frontal boundary pushes through the region on Wednesday -- could see some severe weather with the front as it pushes through as early indications show a pretty decent push of drier air working down into the humidity and heat that will be over us...and with dynamics associated with the front, there could be some pop to the thunderstorms as they push through with the front. More on that as we approach Wednesday.