From Mount Holly AFD. Yup, about sums it up.
A closed upper low will lift slowly toward the Canadian Maritimes and absorb back into the flow through Sunday all while an expansive, ~600 dam (+2 to 3 standard deviations above normal) upper ridge builds across the central part of the country. At the surface, high pressure will remain in place tonight and begin to shift offshore into Sunday. The result thus far has been a superb Saturday under sunny skies, a dry west to northwest breeze around 10-15 mph, and below normal temperatures peaking near 80 degrees this afternoon. Dew points have held steady in the low 50s, with even some localized 40s, and has almost given the air more of an early fall feel to it rather than summer. For tonight, the west/northwest breeze will diminish to primarily 5 mph or less as the boundary layer decouples, though expect a southwesterly gradient component to be held overnight. Skies will clear and temperatures will fall to the mid 50s to near 60 degrees across much of the area, some 5-8 degrees below normal. If you`ve been looking for a night to give the AC a breather and sleep with the windows open, look no further.