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Early December Pattern Discussion


Baroclinic Zone

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Steve d-

Stratospheric warming process has begun at 5 MB:

http://www.cpc.ncep....re/05mb9065.gif

Doesn't that usually imply cold weather within two weeks or something?

i'd take it...35" in BUF and the 7th coldest January on record.

Coldest january of 20th century in Ottawa, coldest January-February period since 1945 in Toronto.

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Wow, the EURO is an unmitigated disaster

NOAA point and click is above normal 5 of the next 7 days carrying about the same ratios as the last 45 days. Pattern change fail.

Euro ensemble mean has a zonal flow at the end of the run while the op shows a big ridge in the east.

Blah.

Average daily temps are dropping each day and we're starting to see some movement in the stratsosphere. The change will come but when and to what extent is TBD. Based on all the numbers guys are putting out there it looks like early January is the target for the change and we should really rock for at least a few weeks, maybe two months.

But all we're seeing now is a step down from incredible record warmth to just seasonal or slightly above.

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It isn't that it isn't cold enough at times, it's just not an active storm threat pattern. Yes yes I know some areas got "buried" the other day but soon enough December will be running behind in snow while running well above temps.

Jerry I think your Jan dates may be too pessimistic, but I'm not overly enthusiastic for the next two weeks. That isn't being a Debbie Downer or warmanista, it's just not living at the north pole while being deluded. There's a reason the post frequency has dropped off on many regional forums and here....because the vast majority see that this pattern blows.

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If only it was only zonal.

Ensembles agree with the op...

12zECMWFENS500mbHeightAnomalyNH240.gif

I can hardly read a map and I have missed this conversation for the last couple day but when I look at that I see a big ridge bulding towards the pole (-AO), a vortex over Hudson Bay and a SE Ridge. There is low pressure in the SW. Wouldn't those lows be ejected into a pressing gradient giving us swfe?

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No worries. LC in his newsletter is calling for motherlode of arctic cold to drop south right around Christmas and making comparisons to 76/77 and 83. Everyone can relax

I can't honestly believe some of the stuff being thrown around wrt arctic cold for Christmas. Maybe I'm wrong....but it makes me wonder if some people should have their degrees revoked.

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I can't honestly believe some of the stuff being thrown around wrt arctic cold for Christmas. Maybe I'm wrong....but it makes me wonder if some people should have their degrees revoked.

LOL..check out his newsletter from yesterday.

Wes and a few others in the medium range thread on the main page do offer some promise around day 10 and beyond. First time I've seen Wes positive

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I can't honestly believe some of the stuff being thrown around wrt arctic cold for Christmas. Maybe I'm wrong....but it makes me wonder if some people should have their degrees revoked.

LC knows his stuff. He says " not sure it will verify" So whats wrong with that!

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LOL..check out his newsletter from yesterday.

Wes and a few others in the medium range thread on the main page do offer some promise around day 10 and beyond. First time I've seen Wes positive

There will be some colder shots of air that come in here, but it still looks like the same old story. Our only hope is to some how try and cash in on any SWFE or wave that develops along the front to our south.

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Well it appears that the 12/6-12 period did bring a coastal low and cold shot (ongoing). Looks like if you didn't have elevation on your side, the snow amounts on the 7th-8th are going in the book as traces. However, I am glad that this did get down into the Mid-Atlantic, even if it wasn't anything memorable.

The models are now keying in on the 12/18-20 period for a Midwest cyclone and Arctic plunge. It is very phase 7 looking, per the MJO composites. The semi-permanent E PAC ridge feature will likely expand as wavelengths elongate toward winter. The PNA will likely be a viable contender through the holidays and the start of January with perhaps another cold shot / snow potential near New Years.

The original forecast for a "decent New England snowstorm 12/20-23" still holds; although, I'd like to make a few adjustments. Baroclinic zone likely arrives 12/20-22, so the threat is more like 12/22-24. Also, it could manifest as another fast-moving coastal storm, possibly favoring the interior Mid-Atlantic and New England.

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That happens almost every Christmas anyways.

Well last Christmas was at least cold and then we had a nice gift on the 12z runs.

At least we are getting deeper into winter so any cold shot will have a little more legs than the previous one. I just don't see a huge change yet for at least another 2 weeks. We'll have to hope we can cash in on these fleeting ridges in the GOA. Maybe in the last week of the month it gets more gradient like towards New England, but that is anyone's guess.

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