There was a minor disturbance that passed over the region yesterday. Satellite imagery through the day showed a small batch of clouds over central NH. When daytime heating was at its max, the clouds, also, were at their max and grew in areal coverage.
Yesterday those clouds got thick enough to generate some rain columns over the lake, that didn't reach the surface. The rain was evaporating before reaching. The evaporation process consumes heat. Temperatures here dropped when those rain columns were visible, and re-stabilized when they went away.
All the activity faded when daylight waned.
This morning's weathermap shows that minor disturbance southeast of Cape Cod. The next minor disturbance is tomorrow. It'll touch off a few thunderstorms in the humid air.
This heat is coming from somewhere -- the southern US. This area is now hot because the heat has made a northbound trip from its permanent residence. At some point on that trip, it runs into the cooler air that permanently resides to our north. If the cooler air puts up a fight, we get weather. Whenever the cooler air decides to reclaim its territory, we get fun weather. Fun for meteorologists.
While we're getting a heat wave in New England, we're on the northern end of the same warm air mass that's parked over the eastern US. Unlike points farther south of here, we're getting a little bit of disturbed weather to go along with the heat because we're closer to the permanent residence of the cooler air.
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