We have a First Alert for possible localized flash flooding Tuesday.
The combination of a cold front coming in from Southeastern Canada and a warm front coming in from Pennsylvania are resulting in a clash of air masses over New England. The wind in much of Maine is coming in from the north, and the wind in Connecticut is from the south, with rich humidity.
This battle of differing air masses could result in a few locations, getting more than 3 inches of rain on Tuesday. A lot of the time, in the much of the region, it’s not raining but when it does rain, it can really come down heavily. And in some cases, we may have one storm, then another, then another and that can ultimately result in localized flash flooding.
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We are expecting a good deal of lightning, too. Perhaps there isn’t so much a threat for wind damage, though that cannot be ruled out.
The most likely time for heavy rain is in central New England Tuesday morning and early afternoon, then shifting south and along the south coast toward the evening. Rainfall amounts in excess of 3 inches are possible for wherever the rain bands set up.
High temperatures will be well into the 80s in southern New England, and in the 70s in northern New England.
Low pressure is developing on the front near Nantucket Tuesday night, perhaps keeping the rain going in southeastern New England through Wednesday morning.
But most of us should dry out Wednesday. Much less humid air with seasonable temperatures should be here for Wednesday and Thursday, and temps should mostly be in the 70s to 80. The most sun will be away from the south coast.
Wind will be coming in from the east for a few days, so the beaches may be a little bit cool.
The next low-pressure system is expected to arrive late Thursday and Friday, perhaps with another period of heavier rain.
Temperatures will warm back up in the lower 80s by the weekend, with a threat for a thunderstorm each afternoon. But the weather is good regardless for our Clear the Shelters effort to adopt homeless pets.
The early call on the Falmouth Road race on Cape Cod is for very sticky weather, perhaps some fog giving way to a mix of sun and clouds. Highs then are expected to be in the low 80s.