It looks like fall
A frontal boundary has become stationary across the central highlands of the state. The result will be much different weather to the north of the front versus the south. For the north, cloudy and cool conditions with chance for showers and isolated thunderstorms are possible. For areas south of the front, sticky dew points and warmer temperatures.
With the uptick in dew points, coastal areas appear to deal with fog, especially Casco Bay eastward. Where it is stubborn, temperatures may not get out of the 60s.
Showers and storms appear to stay confined in areas to the north of the front. A weak impulse to the south appears to stay out to sea. Scattered showers and perhaps a rumble continue for northern areas through Wednesday night and into Thursday.
Front moves out Thursday
It will take a piece of energy on top of the western ridge near Alaska to race south and east Wednesday to begin to tilt the scale aloft in order to move the frontal boundary out on Thursday. It will be a slow process.
The concern I have with this will be for isolated strong to severe storms which could develop Thursday afternoon. I suspect they may be remote. Guidance above hints that eastern areas may have the best chance. This is subject to change as models have flip-flopped in the past day as a result of miscalculating the frontal position and and the temperature / dew point gradient.
Showers clear out of the region early Friday once the front is finally kicked offshore. Drier and cooler conditions return to start the weekend.
Weekend outlook: dry Saturday,
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Penn State '21
AMS / NWA