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Dec 16-20 Snow/Mix events - Going over like a fart in church


HoarfrostHubb

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I'm hoping winds can stay north enough to start as snow here, but you know what, is inevitable for this area. I think we can start as frozen.

Yeah might be a bit difficult with the easterly wind at the onset. We'll see though. Cooler MLs would make this so much more exciting.

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Yeah might be a bit difficult with the easterly wind at the onset. We'll see though. Cooler MLs would make this so much more exciting.

If winds are east, then it will be very tough. Sometimes when we have these highs nose down, Logan is like 360 or 010 and models never get that correct, see Dec 1st. We could have something like that, but impossible to say right now.

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00Z NAM is an ugly freezing rain scenario for W MA, especially parts of the Pioneer Valley and the east slope of the Berkshires. We'd probably get 2-3" of snow, then flip to freezing rain for the heaviest QPF. Freezing rain just doesn't do anything for me. I'd actually rather have rain if I had to choose between the two.

It's so close though as the midlevel freezing line halts just above the northern MA border. A slightly stronger CAD signal, and we could get this line to near the Mass Pike. Still some time...

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What was the prog for 12/13/07 in this timeframe.

If I remeber correctly we were not expecting much up unitl the day it hit. I was working down near the Prudential center that day and it came in like a wall of white. People were shocked. I walked back to Cambridge rather than deal with the #1 Bus down Mass Ave. Traffic was paralyzed.

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00Z NAM is an ugly freezing rain scenario for W MA, especially parts of the Pioneer Valley and the east slope of the Berkshires. We'd probably get 2-3" of snow, then flip to freezing rain for the heaviest QPF. Freezing rain just doesn't do anything for me. I'd actually rather have rain if I had to choose between the two.

It's so close though as the midlevel freezing line halts just above the northern MA border. A slightly stronger CAD signal, and we could get this line to near the Mass Pike. Still some time...

Synoptically it's not too far off, but it still results in sleet contamination getting roughly 100 miles north of the MA/VT border, maybe further. The NAM and other guidance might underestimate the strength of the CAD, but they often miss a sneaky warm layer as well. We cannot rely on CAD alone. We really need to see stronger coastal development, and sooner, south of LI.

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Synoptically it's not too far off, but it still results in sleet contamination getting roughly 100 miles north of the MA/VT border, maybe further. The NAM and other guidance might underestimate the strength of the CAD, but they often miss a sneaky warm layer as well. We cannot rely on CAD alone. We really need to see stronger coastal development, and sooner, south of LI.

Yeah, a stronger secondary low = more low level cold air draining south and dynamics overwhelming the midlevel warming more.

Even with some sleet contamination, it would still be a nice snowfall in CNE and NNE before any changeover as depicted on the 00Z NAM.

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Synoptically it's not too far off, but it still results in sleet contamination getting roughly 100 miles north of the MA/VT border, maybe further. The NAM and other guidance might underestimate the strength of the CAD, but they often miss a sneaky warm layer as well. We cannot rely on CAD alone. We really need to see stronger coastal development, and sooner, south of LI.

I might be reading it wrong but it looks like that although the sleet makes it that far N it comes after the bulk of the precip falls as snow. (At least N of the Vt border)

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You get a period of FZRA/PL from about 72hr onwards...looks like the 0C in the column line makes it somewhere near MHT and it's up around 825mb.

For those looking for winter some are going to get a nice little snow cover locked in with a nice sheen of ice. Anyone N of the MA Pike should still be very excited about this storm.

edit: and those S of the Pike shouldn't be in despair yet either.

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The GFS looks good for most of Maine. A bit of surface development south of LI like other guidance, but with the primary in Canada the lower mid-levels are going to warm. And there's not appreciable CAA to cool things back down.

It seems like forever since there was a really good trend in guidance in the shorter ranges.

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If guidance somehow goes 50 miles south literally millions of people get decent snow.

Nope. The track is fine. It's just too late. By the time the weak coastal surface low develops, the primary over the UP of Mi has done its job and pumped the 850 zero line to Montreal. The coastal can't cool things too much, it can only really stall the warming by switching the low level flow from southeast to east (maybe even ENE). All we have left then is in situ cold and whatever magic dynamics can muster.

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