Today we have a stalled out cold front just east of the area , an area of low pressure which slowly tracked along the front and through the yesterday created a wet/windy afternoon and night-time, this low will linger just off the coast today which will create overcast skies for most of the area, along with periods of showers and drizzle , best chance of rain will be in eastern portions, some showers could contain brief heavy downpours so overall looks like a pretty ugly Saturday setting up, a little nicer once you get towards NE PA points west.
Tomorrow as we see the western Atlantic ridge build back in once again from the east, this whole pattern will shift westward so tomorrow we will begin to see sunshine again although isolated storms cannot be ruled out both tomorrow and Monday afternoons. Tomorrow we will begin a prolonged and dangerous heat wave as temperatures rise into the upper 80s to lower 90s with humid conditions, heat indices will rise into the mid to upper 90s
By Tuesday we will see a large ridge over the eastern US , baking much of the Central/East as a ridge over the Plains merges with a ridge over the west Atlantic
Monday temps will rise a bit more into the lower to mid 90s for most of the area besides high elevation areas, Tuesday through Friday the heat wave will peak with highs in the mid to upper 90s for many , upper 80s to lower 90s over the higher elevations , heat indices during this period will range from 100-110 making for a very dangerous situation, the other thing that doesn’t help is how prolonged this will be, we will likely see at least some areas continue to be in the 90s through next weekend with modest to high humidity , for the most part we will be high and dry Monday through Friday but once we get towards Friday and Saturday we may have to watch for a potential cold front to bring back some unsettled weather.
Just be prepared for some intense heat starting tomorrow lasting through next weekend and please be careful, drink plenty of fluids, we all know the drill. Stay tuned for heat advisories and excessive heat warnings as there will be plenty of them
This pattern should begin to break down during the last week in July as the MJO moves into phases favorable for a trough to drop into the eastern US , and the general rule is when there’s a trough over Japan, expect a trough in the eastern US 7-10 day later and there’s currently a trough over Japan.