Rain, record warmth, and perhaps even some snow before the New Year

This Wednesday won’t be the last time weather is a factor in your travel before the New Year.

A warm front to our south marks the dividing line between the mild air over us Wednesday morning and the ridiculously warm air (for December) coming Wednesday night and Thursday.

As the tropical surge of air continues, rain will break out across the region. Most of the daylight hours in Boston will be dry, but to the south rain will already be occurring. The image below is a loop of the predicted radar through 7 p.m. Wednesday evening. Notice how the rain progresses slowly northward, but the yellow colors, the heaviest, remains to the south.

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Later Wednesday evening the heaviest and steadiest rain will arrive and there could be the rumble of thunder. I expect many areas to see half an inch of rainfall with up to a full inch in any potential downpours with thunderstorms. Remember, it’s been a very dry year, so the rain is actually quite welcome.

Muggy Christmas Eve
The humidity will become noticeable and particularly high for late December on Thursday. While it was also quite muggy a year ago, this will feel more like a summer morning when you get up Christmas Eve. Dew points, a measure of humidity in the air, will reach the 60s, and this would be the level when during the summer months you’d start hearing about discomfort.

Wonderful Christmas weather
Christmas Day will be mild, but dry with more seasonable air slowly filtering into the area. There will be sunshine as well. I’ll call it a Christmas weather gift, but for the ski areas, it’s a lump of coal.


Winter may appear
This trend continues over the weekend, but by Monday next week, it will feel like a December day, not one in May. This could, I repeat could, set the stage for our first chance of wintry weather Tuesday morning.

There is a strong likelihood of another weather system for Tuesday, December 29, lasting into Wednesday, December 30. Since there will be cold air present when any precipitation begins, some snow or mixed precipitation might occur. The exact track, strength, and timing of any storm will be critical in determining if wintry weather is a player.

tuesd mornign 3124.png

Typically, I wouldn’t even mention this a week ahead of time, however, next week is a vacation week and many of you might have travel plans. You should at least be aware of the possibility for something impacting travel. The best chance would be over inland areas, and it does appear any snow would change to rain before ending.

As January arrives, it continues to appear that the month will not bring prolonged outbreaks of arctic air, and while it will snow, there aren’t any early signs of a parade of storminess.

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