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Ah, New England: One day it's 70, the next day, snowflakes come down

Yes, there was a touch of snow in the air this morning, especially along the South Shore. Aaron Perry at NBC Boston explains why, although, to be honest, if you don't have a degree in meteorology, you might not have a clue what he wrote. But here's a radar image of the flurries.

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Comments

70's to snow within ~15 hours has to be the most new england thing i've experienced in a long time.

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Voting closed 12

I'm no meteorologist, but a bit of a weather nerd. Anyone who knows more can correct my mistakes below. :)

1) -8°C to -11°C layer at 950-960mb layer

Some really freaking cold air not that far above.

2) Ocean waters in the low 40s

Source of moisture.

3) Steep low-level lapse rates

Rapid change in temperature with change in altitude (see #1).

4) Salt nucleation coupled with ESE fetch

a) Moisture has to condense onto something to form precipitation. In this case, salt.
b) Wind sending moisture (see #2) in our direction.

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Voting closed 12

Ocean-effect snow.

The same as lake-effect snow, but...you know, the ocean.

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My snow was from The Great Blue Hill.
Mattapan Square.

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Cold, but not at the "really freaking" point yet. At least for here :-)

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My relative measures of temperature get all screwed up when we have a couple of days in the 70s in January. :)

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Could've fooled me, I gleaned more from your comment than most local tv weather forecasts.

Don't be so hard yourself.

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