Unsettled for the first half of the week
While the first half of May has been a bit on the cool side, the trend towards more seasonable temperatures appears forthcoming as we head towards the end of the month. The atmosphere moves into transition as warm, humid air tries to work northeast, while upper-level disturbances to the northwest keep it suppressed through the week. The result is an unsettled pattern through mid-week, and to start the weekend.
Off and on showers through Tuesday morning
Low pressure over southern New England races eastward Monday morning. Any steady rain over southern, MidCoast and DownEast areas ends by mid-morning. Slow moving upper-level disturbances swirl through the region in its wake, with widely scattered showers popping up in the afternoon.
The disturbances continue to slowly work eastward Monday night into Tuesday, keeping off and on shower activity going. A weak warm front works into the state early Tuesday.
Unsettled again for Tuesday
The upper-level disturbances continue to pass through the region on Tuesday. Southern areas appear to stay dry, with showers possible elsewhere. With warmer air nosing in from the southwest and cooler air aloft, if the sun can poke through the clouds, it could trigger an isolated thunderstorm in the afternoon into the early evening.
The final snowflakes of winter 2020-21 Tuesday night
A weak cold front slides southeast Tuesday night. There is enough chilly air aloft where snow showers are possible over the western mountains, which could bring some light accumulations to the Jackman area as well as higher elevations. With the passage of this front, I can say with confidence that these are final snowflakes to be seen for winter. For those of you who are awake to see it in the wee hours of Wednesday, you can wave good-bye to the departure of the season past, while you think of your gardens and get serious about planting.
Thursday appears to be the pick of the week with sun for most areas. Another round of upper air disturbances enters the region on Friday, keeping the chance for scattered showers in the forecast to wrap up the week and start the weekend.
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Seven-day temperature outlook through Sunday
For most areas, the temperatures appear to be just a smidge above average through the weekend. Southwest interior areas may get into the low 70s on Thursday.
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