Sunday: Humid, warm, and a chance of isolated afternoon showers
An occluded front will be pushing into Maine from the west on Sunday. With this front will come isolated thunderstorms and showers, with a slightly more concentrated portion in the northern areas. Southwesterly winds will keep the Portland, Maine areas in the low 80s and central, western and northern areas in the mid to upper 70s. Southwesterly winds off of the ocean will keep Down East and parts of Mid Coast in the low to mid 70s for Sunday. Dew points range from the upper 60s to low 70s, making the air feel soup-like when you go outside. The morning will be mostly cloudy to overcast, but as the front pushes through and moves past Maine, skies should clear up.
Monday: A little less humid, warm, and afternoon thunderstorms in the Portland area
As the low pressure moves away, winds shift westerly and bring in some drier air from the west, causing dew points to drop slightly while temperatures remain warm. The coast gets a chance to heat up with slower wind speeds and winds coming off of the land and not the ocean. The faster wind speeds is concentrated in the northern portions of the state. In the afternoon, some pop-up afternoon thunderstorms may impact the Portland areas.
The GIF above runs from 8 PM Monday to 8 AM Wednesday and shows 3-hour liquid precipitation. A low pressure riding up the East Coast will push into southern Maine on Tuesday. A secondary low pressure system rides west to east north of the state, and its cold front will come behind the first low pressure system. With this combination, rain is expected for the central areas of Maine on Tuesday. Whether it'll be widespread or isolated is still up in the air and will be addressed when more information becomes available.
Slight Temperature Cool-down for Tuesday and Wednesday
A mid-level trough begins to move over Maine on Tuesday, and while it brings a low pressure system and rain, it also brings a temperature cool-down. This mid-level trough is weak and rather short-lived, and temperatures are expected to rise again as a ridge builds and strengthens over the New England area.
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