Unfortunately, it also now appears that flood concerns are elevated on Thursday:
.LONG TERM /THURSDAY THROUGH SUNDAY/...
Models show t-storms accompanying the southeastward moving
front through CPA on Thursday. A wave of low pressure is now
progged to move along the boundary, which has trended slower
with its southward/southeastward progression. There also appears
to be some enhanced large scale lift to support +RA in the form
of right entrance region (RER) upper jet dynamics. High rain
rates combined with ample deep layer moisture will continue to
support an excessive rain/flash flood risk particularly across
the southern tier of CPA on Thursday/D4.
The slower southward movement may also delay north to south
clearing, and we can`t rule out a stray shower lingering early
Friday morning in southern tier/far southeast PA. That said,
much of the area will be firmly in the dry/cooler sector by
Friday afternoon.
Behind the front, a comfortably cooler and refreshing airmass
(much lower humidity) is poised to arrive just in time to begin
the month of August. Slightly below average daytime highs
70-80F and lows 50-60F are forecast along with no rainfall through
the first weekend of August. Dewpoints will plummet into the