There's a west to northwesterly flow of basically dry air from south-central Canada to the northern part of the Middle Atlantic states. The flow changes orientation farther south. A light northerly flow is helping slightly less humid air to seep southward.
In parts of the Northeast, a sky looking as blue and clear as the one in the picture will be quite a departure from the look of the rainy skies that were much more common earlier in the summer.
The steering winds aloft are changing, and the next phase looks like it will feature a northwesterly flow of cooler air this weekend and much of next week.
It's going to be hot hazy and humid in the much of the Northeast today through Thursday. The recalescent, sudorific, canicular, pyrogenic frying heat gains our attention.
A line of persistent showers and thunderstorms stretched from Long Island Sound to Cape Cod. Some areas in this zone had more than 3 inches of rain this morning, and there can be highway flooding in localized heavy showers this afternoon and evening. This radar shows the rain zone just after 10 a.m. ET.
This map shows the predicted upper-air flow for tomorrow night. Our timing estimates suggest showers and some thunderstorms could affect the I-95 corridor from Portland and Boston to New York City (and perhaps Philadelphia) on Sunday.
For the start of this "Olympics of the Forest," the weather looks good, as forest we can tell. From DC to NYC, it looks sunny for at least the next two, tree days.
As moisture from former hurricane Delores moved northward, the dynamic changed, and thunderstorms broke out. This map shows the more than 300,000 strokes that occurred between early yesterday and early today.
The recent volatility of the weather in many areas of the Central and Eastern states is demonstrated by the widespread thunderstorm activity of the last couple of days. The lightning map shows hundreds of thousands of lightning strokes between 7 a.m. ET yesterday and about the same time today:
A narrow band of territory that in winter is one of the Buffalo area's southern snow belts received more than 5 inches of rain in just a few hours. Water seemed to rage everywhere, and people had to be evacuated from their homes in the dark of night.