In July the pattern over the US was controlled by a huge upper level heat ridge which produced brutal heat over much of the country especially from the Rockies on east, later in the month the heat ridge shifted west but a Bermuda high took over ensuring that the eastern US remained dominantly hot and humid, the center of the country baked under the heat ridge, the only are of cool was over the Pacific NW
The heat ridge will continue to be a dominant weather feature in August, however it did shift west and weaken slightly, so the forecast area will be on the eastern side of the ridge with a NW flow aloft, and constant upper level disturbances dropping SE into the area, which will one keep the hottest conditions west of us and number 2 lead to an active month with severe weather threats and heavy rain threats.
I expect a Bermuda high to make a presence occasionally which will bring our share of hot humid spells with a SW flow and also lead to slow moving cold fronts, but I also expect notable cool downs after frontal passages for the forecast area, which we did not see in July.
I drew out the set up I expect, in the dark yellow circles I expect warm humid and stormy conditions , over the upper Midwest and Desert SW, I expect it will be well above average temperature wise and stormy as the pattern will not be favorable for cool downs and the NE US will be average to slightly above normal with stormy conditions as we will be more vulnerable to cool downs from SE Canada when Canadian high pressure drops south behind cold fronts
From Texas to South Dakota I expect brutal heat and dry conditions to continue and the historic drought to get worse and the Pacific NW to be continued cool and unsettled as trough remains in control, basically identical to July
I do think the heat ridge will slowly weaken and shrink through the month as an El Nino episode to begin to establish itself but I expect the break down to be very slow and not really too noticeable until we get into September
For the forecast area ( from Scranton PA to Delaware then north to CT including NYC and Philadelphia metros) I expect August will not be as hot as July and we will experience stormy conditions occasionally. We will still get our share of heat and humidity ahead of cold fronts and when the Bermuda high rears its ugly head . The month will average slightly above normal as we enter a more transient pattern rather tan constant heat and precipitation will vary depending on if your area gets hit by storms etc, I expect many areas will exceed the average rainfall by a lot.