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December 16-17 wintry obs/discussion


ORH_wxman

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That one weenie close up shot of the branch looked close to 1/2 inch

yeah it's so hard to get a sense of perspective though in that pic. i couldn't tell how big that branch was. could be an 1/8th of an inch of ice on that or 1/2.

when you zoom in on the handle of the grill...it looks like some decent accumulation on there

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That was pretty crazy this morning. Waking up and seeing that. Probably a third inch to 3/8ths was my estimate but didn't actually have time to get the ruler out and measure ice thickness. I'll have to post some of the pics later. Definitely a pretty big ice event, but I wouldn't call it major since it likely fell short of warning criteria...but not by a whole lot.

It was 28F when I left, but we should inch above freezing this afternoon with some insolation and just the fact the CAD is exhausting its dewpoint source.

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~1/4" - 1/3" ice accretion and temp still holding just below 31 in shrewsbury. Potential for more light frz rain / frz drizzle looking at radar. This may be the worst ice storm imby (literally where I live) since nov 2002. I mean the dec 08 storm did knock down branches in my backyard, but there was literally no ice accretion below 15'-20' agl, but there was close to 1/2" accretion 50'+ agl (based on measurements from fallen branches) .. very impressive cold just above the surface that night.

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~1/4" - 1/3" ice accretion and temp still holding just below 31 in shrewsbury. Potential for more light frz rain / frz drizzle looking at radar. This may be the worst ice storm imby (literally where I live) since nov 2002. I mean the dec 08 storm did knock down branches in my backyard, but there was literally no ice accretion below 15'-20' agl, but there was close to 1/2" accretion 50'+ agl (based on measurements from fallen branches) .. very impressive cold just above the surface that night.

This icing event was definitely colder than the Dec 2008 event. Just way less QPF of course. We were lucky in a sense that last night didn't drop 3/4" of QPF on us...that would have been a major ice storm because we had a great dewpoint drain going on so the latent heat would have been easily offsetted.

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This icing event was definitely colder than the Dec 2008 event. Just way less QPF of course. We were lucky in a sense that last night didn't drop 3/4" of QPF on us...that would have been a major ice storm because we had a great dewpoint drain going on so the latent heat would have been easily offsetted.

This drain was superior....I was rain in 2008.

Line was roughly 495, as opposed to 128...

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This drain was superior....I was rain in 2008.

Line was roughly 495, as opposed to 128...

This airmass was definitely colder than the 2008 one. The CF was in roughly the same spot as 2008, but instead of being 33-34F on the cold side of it and having to go back to 495 to get 30-31F temps, it was 28F this time on the cold side with temps in the 24-27F range back in the hills...and actually even up just north of you was in the low 20s. That was a very efficient transport. Just oozed right down the CP of S Maine and the NH seacoast.

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This airmass was definitely colder than the 2008 one. The CF was in roughly the same spot as 2008, but instead of being 33-34F on the cold side of it and having to go back to 495 to get 30-31F temps, it was 28F this time on the cold side with temps in the 24-27F range back in the hills...and actually even up just north of you was in the low 20s. That was a very efficient transport. Just oozed right down the CP of S Maine and the NH seacoast.

i'm impressed by how cold the low levels have ended up. it was a cold HP but i didn't think it looked as cold as it actually is. with the core of lowest thicknesses headed E of us and the surface HP actually being a bit far north (modeled) i thought it you'd be in the 27-30F range yesterday.

there was a time sat PM that i really thought it might not get too cold at all. it was radiating well down on the Cape and that's generally a good first guess sign that the best low level advection over SNE is done. but it kept on going.

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