Unsettled but cooler through the rest of the week A slow-moving front will exit southern Maine Tuesday night, allowing skies to clear across the state as high pressure builds in from Canada. The Weather Prediction Center has issued a marginal risk for excessive rainfall through Wednesday morning across southern areas, with localized flooding possible. Cooler, drier air will settle in overnight into Thursday, with lows in the 50s and 60s. A broad upper-level trough is expected to remain in place midweek (more on that below), keeping highs in the 70s and supporting isolated showers or storms, mainly in western Maine on Wednesday and again on Thursday if afternoon clearing occurs. Rainfall should stay light. The trough moves east Thursday night into Friday as high pressure and ridging build in, leading to a warmer, drier weekend with highs in the upper 70s to low 80s. Another trough may bring unsettled weather and higher humidity by early next week. Showers with possible thunder for Wednesday Tuesday 8 PM (00z Wednesday) to Wednesday 8 PM (00z Thursday) - This HRRR model GIF shows most of the active convection lingering in the area tonight into tomorrow, especially in the southern portion of the state, due to the frontal boundary slowing down. A few small, isolated showers or weak thunderstorms are possible tomorrow along the southern interior and western foothills. However, the limited spatial coverage suggests that any activity will be fairly short-lived, and therefore shouldn’t cause any major flooding concerns. As high pressure builds in from the north overnight, drier air will gradually filter in, helping suppress further development and allowing skies to clear from north to south. Pattern remains unsettled through late week, |
Mike Haggett
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