Increasing Heat and Humidity...
In most years, we get a 4-6 week span where the furnace is off and the AC still isn't on...we save some money. That hasn't been the case this year...yet. Air conditioners will be working overtime tomorrow as heat and humidity build back in. As it arrives late tonight, fog may be an issue (especially near the coast) and that new airmass could greet us with some elevated convection (T-storm)...as parameters spike a bit by morning.
We will be in the thick of that air tomorrow...highs in the mid to upper 80s and dewpoints well into the 60s...it will be very uncomfortable. Late in the day the treat of thunderstorms will be high as a coldfront comes barreling through lifting that sticky and hot air. LI's across the interior could get as low as -6...that is where there is the greatest threat for severe weather...hail and damaging wind. Closer to the coast and especially over SE Mass, the air will be more stable due to the SW wind bringing in more of a marine influence from south of New England, so any storms should be weakening as they approach the coast.
The front will slip through after 8PM and an entirely new airmass will build in for the end of the week and the upcoming weekend. Air will be flowing in from our friends north of the border in Canada for a few days. Free AC for a change!
