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A stormy Monday; unsettled midweek into Thanksgiving

11/23/2020

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A raw, damp, and windy Monday

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Low pressure intensifies as it heads into Atlantic Canada for Monday. Snow / mixed precipitation in the north and mountains to start off changes to rain before flipping back to snow as precipitation ends early this evening.

For the coastal plain, this appears to be mainly a rain event, but I can't rule out a few flakes as the low hauls down cold air on the backside. A rumble of thunder is possible, with the best chance of that for the MidCoast and DownEast areas. 

All areas see steady precipitation clear out by late afternoon south and west, and by 7-8 PM north and east.

Snow showers are expected to continue for the western mountains overnight into Tuesday. 
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With the abundance of rainfall ( ½-1½+ ) and falling temperatures sets up a potential for flash freeze and icy roads this evening into the overnight. All areas wake up below freezing to start Tuesday. 
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A slight adjustment to the precipitation map based on the latest forecast trends. Higher elevations in the west and areas to the north see more frozen precipitation. Some areas along the coastal plain may see 2" of rain from this event. The north and mountains should watch out for pockets of freezing rain which may slick the roads up, on top of the snow. 
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No real changes to the wind idea. The best chance for power outages will be for MidCoast, DownEast and the mountains. On the backside of the storm, the wind shifts to the northwest. With the storm intensifying in its departure, expect gusts in the 25-35 mph range through Tuesday afternoon, before settling Tuesday night into early Wednesday. 

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Outlook through Thanksgiving

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Snow showers persist in the mountains Tuesday until the wind drops. High pressure passes through overnight Tuesday. A weak disturbance on the backside of the high may bring some snow shower activity on Wednesday, but no accumulation of concern is expected. On the heels of that, a longwave frontal boundary could bring snow and/or a wintry mix to start Thanksgiving morning for interior areas, and rain for the shorelines. Confidence is good for precipitation, but who gets what for how long is still to be determined. Interior areas can anticipate potential for icy conditions Thanksgiving Day.

Temperature outlook through Sunday

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Winter precipitation types

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Will there be rain, ice or snow? This graphic explains how having different layers of warm and cold air between the clouds and the ground determines the type of precipitation that hits the ground. nssl.noaa.gov/education/svrwx101/winter/types/

Be prepared to receive alerts and stay updated!

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​- Mike
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    Mike Haggett
    Kennebunk, ME

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