A backdoor cold front that came through Monday night and early Tuesday is serving to keep the rain and scattered thunderstorms at bay. This back door cold front pushed the warm front southbound, and pushed the warm unstable air mass south with it, and has given way to a much cooler and more stable marine air mass which has and is expected to continue inhibiting the development of scattered showers and thunderstorms during this afternoon and tomorrow as well, making for a much drier week than expected so far.
The only caveat to this back door cold front is the presence of a rather chilly air mass, and the easterly winds will eventually bring in overcast skies , and drizzle/mist tonight through tomorrow. Temperatures today for highs east of the Delaware River will struggle in the mid 50s to low 60s west of the Delaware river upper 60s to mid 70s can be expected, farther away from the Atlantic influence and marine air mass.
For Thursday the back door front is expected to move northward as a warm front which could make for a big temperature spread, areas from East, Central PA to SE PA and SNJ points southwest will warm back into the mid 70s to low 80s , but clouds and drizzle could keep temperatures in the 60s for the good chunk of the area that is north and east of those areas including most of NJ, NYC,LI and CT.
A strong cold front is still expected to bring widespread showers and thunderstorms Friday and widespread heavy rainfall as the trough turns negative and pulls in tropical moisture, highs on Friday will be in the mid 60s to low 70s under influence of clouds and rainfall, some thunderstorms could be strong with gusty winds up to 40 mph, otherwise just a pretty rainy day is expected with rainfall amounts totaling 1.5-3 inches area wide through early Saturday, heaviest rainfall expected farther west lighter amounts east.
Showers and storms will clear Saturday morning and give way to at least partially clearing skies and comfortable , seasonable temperatures in the mid 60s to low 70s
Sunday as a potential storm system develops and lingers around the coastal waters, a cool marine air mass will again move in from the east-northeast with increasing clouds and a chance of drizzle and showers developing Sunday night through Tuesday, the closer the storm is to the coast, the more rain there will be, the farther away it is the less rain there will be and temperatures will be mostly in the lower to mid 60s for highs and lows in the upper 40s to mid 50s