The latest guidance suggests that there still may be enough lift for showers and thunderstorms to be at least scattered in nature on Sunday. Therefore, I have gone with scattered showers and thunderstorms. I think the coverage may be a little less than today. Atmospheric movement may be even slower than today and thus any thunderstorm that does form could drop some decent rain amounts and produce localized flooding.
On Monday, it appears that we will not have much of a triggering mechanism for thunderstorm development, but that there may be enough lift by old outflows and a front creeping southward in a humid environment for very isolated thunderstorms in the afternoon and evening hours. I think most of the region will see partly sunny skies and remain dry. We will keep an eye on it.
For Tuesday through Friday, a warm front will be moving northward and meandering across our region. This may act as a triggering mechanism to develop showers and thunderstorms each and every day. We may also be contending with a series of weak cold fronts Wednesday through Friday. There is the possibility of some severe weather during this time frame as the Philadelphia Metropolitan area should enter the warm and unstable sector.
For temperatures, the MOS guidance and thicknesses suggest values of 87-89 degrees for the next seven days without much variation. It is possible that later runs suggest Wednesday through Friday, may reach into the 90 to 92 degrees if we see more sun and less t-storms. However, dew point temperatures in the upper sixties are expected throughout the week signaling an uncomfortable, humid period ahead.