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12/26-12/28 Potential Snow Threat


CooL

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Ensemble mean is rather ugly for the first 3/4 of the storm. Some back end snow is possible but it has the majority of the storm as rain, possibly beginning as snow. It is interesting how it is the GFS and the Euro against the JMA (which is gorgeous), the UKMET, the NOGAPS, and the Canadian. What the heck? Unfortunately, you almost have to go with the Euro, GFS combo, but it is quite a shift from their previous runs, so possibly they just had a bad run? Here are the verification scores at 5 days. Note that the Euro is number 1, the UKMET is 2, the GFS is 3, JMA is 4, Canadian 5, and NOGAPS 6. So it is 1 and 3 against 2,4,5,6

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It's over JFK, still would be horrible

Another 50-100 mile shift east would put us back in the game, however, especially for northern suburbs. Still think this could be a wintry event here with the blocking. We need the XMAS storm to gain some steam though to knock down heights on the East Coast. The last thing we need is another cutter with the low spirits around here lately. Been a tough stretch since November for winter lovers. Luckily I can chase this one as it's vacation.

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Another 50-100 mile shift east would put us back in the game, however, especially for northern suburbs. Still think this could be a wintry event here with the blocking. We need the XMAS storm to gain some steam though to knock down heights on the East Coast. The last thing we need is another cutter with the low spirits around here lately. Been a tough stretch since November for winter lovers. Luckily I can chase this one as it's vacation.

Good for you Nate. Hopefully we can get some front end here, just to see some snow.

Looks like 18z gfs will transfer earlier. Might save northern areas

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This is turning ugly compared to yesterday... I was thinking there would be at least some hope west of I-95 yesterday with a secondary low near NYC. While changing solutions because of one run isn't the way to go given how models change, with the latest runs I'm wondering if even a NYC track might be too far east, GFS doesn't have a separate secondary low pressure.

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What a disaster. This storm went from a glc to an east coast storm back to a glc on the gfs.

It's the pattern, which doesn't argue for a favorable storm track for us. A bad PNA and Pacific pattern along with transient blocking up north argue for a big Midwest storm that maybe transfers energy in time for well-upstate NY and NNE. The only way this gets salvaged is a huge, locked-in block to force a transfer well south of us and a track east of us. The atmosphere seems to be holding onto the Nina pattern, and until we can get the Pacific to cooperate, it will be almost impossible for us to get a solid winter event without a crushing Atlantic block. Maybe after the New Year, hopefully.

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It's the pattern, which doesn't argue for a favorable storm track for us. A bad PNA and Pacific pattern along with transient blocking up north argue for a big Midwest storm that maybe transfers energy in time for well-upstate NY and NNE. The only way this gets salvaged is a huge, locked-in block to force a transfer well south of us and a track east of us. The atmosphere seems to be holding onto the Nina pattern, and until we can get the Pacific to cooperate, it will be almost impossible for us to get a solid winter event without a crushing Atlantic block. Maybe after the New Year, hopefully.

Yeah, just goes to show how a lousy Pacific pattern can trump a -NAO/-AO for us. It looks like

we reverted back to a -PDO type pattern in December after the El Nino faded early.

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IF this does come to fruition....it proves that the pattern and modeling TRENDS with that pattern are much more reliable than what a model SHOWS....and how for the most part the modeling even beyond just 48 hours can be used best to give an idea as to what type of storm and approximate timing/direction it is headed.....not specifically what states and counties get snow or rain, etc

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It's the pattern, which doesn't argue for a favorable storm track for us. A bad PNA and Pacific pattern along with transient blocking up north argue for a big Midwest storm that maybe transfers energy in time for well-upstate NY and NNE. The only way this gets salvaged is a huge, locked-in block to force a transfer well south of us and a track east of us. The atmosphere seems to be holding onto the Nina pattern, and until we can get the Pacific to cooperate, it will be almost impossible for us to get a solid winter event without a crushing Atlantic block. Maybe after the New Year, hopefully.

The blocking isn't 100% ideal, but it was still pretty good. If we had a better PAC pattern, then this blocking would have sufficed. There was an area of confluence between the shortwave and the block, but the Pacific pattern was just too awful in that although our airmass has improved, it's still not great, and the SE ridge proved too strong via the ridging being too far west and our storm amplifying way too early.

Previous runs maintained a much stronger WNW and NW flow at 500mb for our area, forcing redevelopment much further SE. But a lot of that wasn't necessarily synoptic confluence, it was small scale vorts and such that were unlikely to survive several model cycles.

Of course, a truly great block could have been enough to overcome this, but I'm definitely more "annoyed" at the PAC than I am at the blocking.

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