Monday 9 a.m.
A cold front moving through the Northeast is causing rain, but another large high pressure area is poised to take over in the Northeast by tonight. Northerly flow ahead of the high pressure area will bring in cooler air for tonight and tomorrow, but southerly winds behind the high will make it warmer Wednesday through Friday. The video has more.
It will turn humid across the western Great Lakes region on Wednesday, and a weak disturbance rippling through aloft may cause raise the chance of thunderstorms there. In the Middle and North Atlantic states, it will become warmer from Wednesday through Friday. After today, it seems unlikely to rain in the I95 corridor until the next cold front approaches late Friday or Saturday.
This pressure analysis suggests the cold front was on a line from Pennsylvania to Kentucky at 7 a.m. EDT.
With a high pressure area over Maine, a low pressure area over western Indiana and an upper-air storm spinning over the western Great Lakes, the stage is set for wet weather in the Middle and North Atlantic states.
This map is a rainfall forecast from the NWS Middle Atlantic River Forecast Center located in State College, PA.
The upper-air flow forecast for this evening shows the trough that helps to support rainfall ahead of the cold front.
After reaching the 80s today from NYC to Boston, it might not be that warm again through much of next week.
A noticeable push of cooler air will spread southward from Ontario and Quebec into the eastern Great Lakes and New England between tomorrow and Saturday.
A cold front from eastern Canada will slide southward along the East coast between late Friday and the end of the weekend. For the area from Philadelphia to Boston, where temperatures will reach the summery 80s each day through Friday, it will mean a noticeable change to cooler weather.