The storm that brought substantial rainfall to the Northeast will depart through eastern Canada today, and a high pressure area will take its place. Ahead of the high, tomorrow will be a cool day with northwesterly breezes in New England and the Middle Atlantic states. However, with the high pressure area offshore and another cold front approaching, there will be an increasing southwesterly flow of much warmer air on Thursday. This video shows that sequence of events then proceeds through the coming weekend.
A cold front will approach the I-95 corridor on Thursday night, but computer models show differing ideas on whether it moves right through or instead stalls and prolongs a shower threat into Saturday. It appears the weekend will start on the cool side, but that much warmer air will sweep into the Northeast on Sunday.
However, after the warmup, another cold front will move through the Great Lakes and Northeast with at least some rain. This map contains the forecast for Sunday evening, and includes precipitation predicted for 2 p.m. through 8 p.m. ET.
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: