By Eric Fisher

BOSTON (CBS) — Tropical Storm Erin has formed off the East Coast and while the storm will remain relatively weak and out to sea, it interacted with another weather system to produce some locally heavy rainfall Wednesday into early Thursday morning. So indirectly, we’re getting a visit from the tropics!

Tropical moisture continues to stream up the east coast overnight, and will get squeezed out over the top of us in the form of scattered tropical downpours. There may be a few rumbles of thunder and flashes of lightning mixed in, but primarily we’re watching out for localized heavy rain and some street flooding. While the majority of the area ends up with 0.5 to 1.5″ of rain, there will be some localized 2″+ totals.

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(WBZ-TV Graphic)

After midnight, the heaviest rain will shift from the Boston area south and east with activity tapering off/weakening to the west. This is where the highest risk of some overnight street flooding will be. Otherwise, it’s beneficial rain after a fairly dry month of August!

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The back edge of all the showers should be to Boston by 6 a.m., drying out for the bus stop and morning commute. It will take a little longer across Cape Cod with the last of the rain pushing away from the Outer Cape between 8 and 10 a.m. Skies will also be clearing out from west to east, with a warm summer day to follow in the 80s.

To go along with the change in the weather will be a change in humidity. After a couple of very dry days, we’ll notice dew points jumping up through the 60s for a muggier feel, which will last into Thursday morning.

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The cold front will be offshore by Thursday morning, leading to beautiful summer weather to end the week with highs in the 80s both Thursday and Friday.

Eric Fisher