Tuesday 10 a.m.
The storm now coming through the Eastern states will bring most of New England's rain later today and tonight with some leftover showers tomorrow. Drier air will spread eastward behind the storm, and fine weather will then be the rule into the weekend.
At 10:14 a.m. EDT, the primary rain associated with the Middle Atlantic portion of the storm showed up quite well on the Philadelphia radar: This rain band is a good example for how you can use accuweather.com on your mobile device to make immediate plans. If you are in the rain area, you can get a sense for when it will end... and if hasn't arrived, the available movie loop will suggest when it should start.
On this satellite picture, we see the plume of moisture advancing northeastward from the Ohio Valley.
In this picture, the sun had set as seen from the ground. However, sunlight was able to light up the clouds from below to create this look outside my home:
Now, drier air has arrived, and most of the Northeast will have abundant sunshine today and tomorrow.
A front that will usher in slightly less humid air for the Northeast tomorrow will trigger locally strong thunderstorms today.
Thunderstorms will continue to erupt near the northern edge of the heatwave, enhanced by a series of disturbances rippling along in the upper air flow. This is the NWS Storm Prediction Center's severe thunderstorm outlook for today
... the main upper air steering current moves eastward across the northern Plains, then dives southeastward toward the Middle Atlantic states. The core of this current defines the rim of the hottest weather and serves as a conduit for clusters of thunderstorms.