High pressure at the surface and aloft will build across the US East Coast today and Wednesday with dry conditions and increasingly warm temperatures. A warm front crosses the region Tuesday into Wednesday with sunny and hot conditions expected with highs in the mid-to-upper 80s for most Valley locations. Overnight lows in the lower 50s are expected tonight.

Canadian wildfire smoke will be a factor in daytime highs Wednesday. The National Weather Service in Caribou also notes that "[a]t this point will call the smoke as haze in the forecast for now with it likely to remain aloft. However, near surface smoke modeling from the HRRR [a high resolution short-range forecast model] strongly suggests smoke making it down to the surface from the Moosehead Region into the North Woods and NE Aroostook County...[which] may result in reduced visibility and a cut in incoming solar radiation." While other models vary regarding the amount of surface smoke, any haze resulting from smoke aloft or at the surface may impact temperatures across the SJV Wednesday.

A cold front approaches Wednesday night as the high pressure ridge aloft begins to break down with partly sunny skies in the morning allowing temperatures to climbing into the mid-80s in Fort Kent and vicinity. As the cold front moves across the region, afternoon showers and scattered thunderstorms are possible, and a few storms may become strong with gusty winds, small hail, and heavy rainfall. Storms look to wane Thursday evening with the loss of daytime heating. A chance of showers continues overnight into Friday morning.

A stalled frontal boundary remains near or across Maine Friday with partly cloudy skies and isolated showers in the afternoon/evening. Some model uncertainty is present for the weekend with NWS Caribou stating, "This weekend has some interesting components to it as waves of energy track up along the boundary. This will likely result in a wet Saturday across the area with numerous showers and even some steady rain. Temperatures will not be as cold as previous weekends with highs in the upper 60s."

This scenario looks to bring a chance of showers Saturday with scattered showers Saturday night and Sunday with high pressure bringing mostly sunny skies by Monday, though a chance of isolated showers remains possible for Fort Kent and vicinity Monday afternoon/evening.

 

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