The core of a high pressure system on this morning’s weather map is still located in the eastern Great Lakes, and it will drift to the east today and tonight. With the pressure gradient relaxing between both this zone of high pressure and a fairly strong body of low pressure located in the Canadian Maritimes, the winds won’t be nearly as gusty as they were yesterday. But there should still be a breeze, with winds out of the northwest averaging a sustained 10-15 mph from midday on.
Most temperatures will be in the 70s this afternoon, although some places will return to the 80s once again. Afternoon temperature in many places yesterday near and especially to the SOUTH of the Mason-Dixon Line climbed well into the 80s (including 88 in Baltimore). And, even though these same locations will probably come in 4-6 degrees lower than they were yesterday, they’ll probably still be in the lower and middle-80s. Nonetheless, the change in the air mass which has occurred during the past 36 hours is truly remarkable. Have we had Memorial Day and Labor Day occur within a few days of each other??? Dewpoint temperatures that were mostly in the 70s on Wednesday afternoon, when it felt “truly tropical,” are now in the 30s and 40s. We expect another dry, cool night tonight under a clear sky.
Tomorrow will start off sunny, but will probably end on a cloudier note. There’ll be a series of fronts moving across the Great Lakes and Ohio Valley, which should reach the Northeast and mid-Atlantic states tomorrow night and on Sunday. The “leader” will be a warm front, which should generate some clouds in the afternoon, but the global models do hold off on bringing any rain to areas east of the Appalachians until tomorrow night and early Sunday. We feel this timing makes good sense, because dewpoint temperatures are still expected to remain quite low (at least for early June’s standards) during the day tomorrow. Tomorrow night, a cool front dipping southward out of southeastern Ontario will descend upon upstate New York, and then it’ll start to weaken later tomorrow night as it moves into eastern Pennsylvania, southeastern New York and southern New England. The atmosphere should moisten up by the time this second boundary (the cool front, not the warm front) reaches the area. The combination of both this and an impulse of upper-level energy sliding across the area will probably trigger a couple of showers and a spotty thunderstorm. We’re also going to be allowing for a shower and thunderstorm at any time on Sunday.
As for Monday and Tuesday, the prevailing thoughts now are that much of the time will be dry along the Eastern Seaboard as that “cut-off” low consolidates over the western Atlantic. A northwesterly flow of air aloft will prevail in much of the region early next week, so it certainly doesn’t look like any “excessive heat” will be making a comeback any time soon.
Have a good weekend!!!!