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December Pattern Disco- 2013


Damage In Tolland

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HM talked about this 2 months ago

 

Okay,  but you are not making any startling revelations with that... 

 

In fact, it is common knowledge to the Meteorological community that the EPO/NP is the primary cold loading pattern for N/A ...for decades really. And, we've talked about it for years actually.    We've merely enhanced discussion of it since it became the dominant teleconnector ... however long that is/was.

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We loose the epo we torch its pretty simple read Don S

 

EPO+/AO+ is not a good combination. Needless to say, one should not assume that the EPO would stay predominantly positive for the remainder of the winter. Some winters following a November with an EPO of -1 or below wound up predominantly positive (e.g., 1966-67) and others remained predominantly negative (e.g., 1978-79).

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EPO+/AO+ is not a good combination. Needless to say, one should not assume that the EPO would stay predominantly positive for the remainder of the winter. Some winters following a November with an EPO of -1 or below wound up predominantly positive (e.g., 1966-67) and others remained predominantly negative (e.g., 1978-79).

Haven't the euro ensembles though had a bad track record so far this winter?.

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Haven't the euro ensembles though had a bad track record so far this winter?.

No they have been good overall. I think at one point they were mild in November briefly . Also, the GEFS caved a little today. I think it's best to wait until Monday, but my gut says the euro ensembles may be more right than wrong. It's not a complete torch as modeled...although it would be more hostile though for snow....especially down here.

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No they have been good overall. I think at one point they were mild in November briefly . Also, the GEFS caved a little today. I think it's best to wait until Monday, but my gut says the euro ensembles may be more right than wrong. It's not a complete torch as modeled...although it would be more hostile though for snow....especially down here.

Just wondering what kind of impact would this pattern have in Nova Scotia Canada?.

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It's funny. I was looking at the Dec 2007 and 2008 reanalysis maps and aside from that big storm on 12/16/07 and a couple in Dec 08, the pattern was pretty bad for snow. Seems like a similar pattern coming up next weekend into the following week.

Folks think if theres no coastal or if there is fast flow it can not snow. A lot of us have been around for too many years, its snows in all kinds of setups, its winter. the LR euro is not a total disaster either.

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It's funny. I was looking at the Dec 2007 and 2008 reanalysis maps and aside from that big storm on 12/16/07 and a couple in Dec 08, the pattern was pretty bad for snow. Seems like a similar pattern coming up next weekend into the following week.

Yep it's not far off from that which is why we have a chance. However you have to remember no two patterns are alike. A small change in the orientation of a ridge or trough might mean the difference of a low going south of ACK vs a low going over SNE. Just give it until Monday or so. Even if it sucks for a week or so, it does seem like it may not last. Every month has crappy periods too. December 2008 was loaded with them.

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Yep it's not far off from that which is why we have a chance. However you have to remember no two patterns are alike. A small change in the orientation of a ridge or trough might mean the difference of a low going south of ACK vs a low going over SNE. Just give it until Monday or so. Even if it sucks for a week or so, it does seem like it may not last. Every month has crappy periods too. December 2008 was loaded with them.

Ya I remember getting 14" with that 12/16/07 storm but then the pattern went zonal and mild with a cutter that followed about a week later. Then came Jan 2008 which sucked and Feb 2008 which rocked. It's all about timing a storm with the cold around.
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Looking at the euro ensembles to me still have the PV over Hudson bay do at least it's on our side of the globe. Also it looks like more of a trough over B.C rather than the GOA. It looks like it would be a transient feature as Scott alluded too. We"ll see I guess. The EPO looks like its reloading by D15 so perhaps by x-mas the pattern gets better?

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Seems like a slow start is a theme so far for this decade (save 10/29/11 and 11/7/12) as opposed to the 2000's where we enjoyed snowy Decembers. It's a bit premature to say this will be a slow start I suppose but I for one would like to see improvement on the Atlantic side. Rolling the dice with overrunning down here usually doesn't work out all that great. MJO looks like it's going to wake up a little per the GFS ENS. Too bad it's progged to be in phases 3-4.

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I don't think anyone is panicking, but it's likely the first week of this month isn't going to go quite as well as we hoped it would a week ago.

I know the first week better than most...and it's usually not quite ready for prime time. Mets are targeting 12/7-14 and that seems reasonable.

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I don't think anything changed. As we started to go out in time since Wednesday or so, the GOA feature showed up. It's not like things just trended warmer. The weeklies even showed a SE ridge expanding north albeit weak. The 7-14 is the hopeful period. It's not a lock, but offers the best chance. Nothing is ever a lock in meteorology. I really wouldn't panic about winter or even this month. Not yet anyways.

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I also think weenies are thinking winter cancel. No, it just means it possibly might be tough mid month. I'd relax a bit. December 2008 wasnt a great pattern except for about 4 days in which we got almost 30" of snow.

 

Sounds like it's standing room only on the Tobin.

 

We have to remember that the first snowfall over 1" across the region typically doesn't happen until that 7th (BDL) to 14th (BOS/PVD) time frame. I mean maybe Will has a case to gripe in ORH because their long term average first date for 1"+ snowfall is 11/27 (and even they had that 0.5" earlier this month).

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