The dangerous heat will relax this upcoming week for the eastern United States. A stout pattern change will take place thanks to a deep trough digging into the east Monday into Tuesday (see Fig. 1). This trough will setup a northerly flow across the east allowing a strong cold front to move across the eastern half of the United States Monday through Tuesday. Behind the cold front, temperatures and dewpoints will be much lower–making it feel very pleasant outside for late-July. The Climate Prediction Center has high probabilities of below average temperatures (days 6 through 10) for the eastern half of the United States (see Fig. 2).
It appears the below average temperatures will remain across the eastern half of the United States through the end of the upcoming week. By the end of the upcoming week, temperatures will begin to approach seasonal levels and should return to average by next weekend.
Temperatures will be well below average for late-July during the first half of the week. High temperatures will fall into the low to mid-80s for much of the Southeast Tuesday through Thursday with lows in the 60s–a few upper 50s possible. Temperatures climb into the mid-80s by Friday. Farther north, temperatures near the Great Lakes and the Northeast will be in the mid-70s for highs with lows in the 50s. Farther west, the Southern Plains will not cool as readily but highs will fall into the mid to upper-80s with lows in the mid to upper-60s (still below average for late-July).