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Medium/Long Range Discussion


tombo82685

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12z GFS Day 11+ looks exciting! Its way out there, but still good to see...Winter officially arrives 12/10ish?

post-8091-0-49719900-1354034886_thumb.gi

man, thats kinda sexy with that block height anomaly and coinciding 50-50 low...but yes, the gfs has been showing that kind of block for 300+ hours now for 2 weeks straight.

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Looks like a very interesting pattern setting up for December - I see JB is going for another of his majority of the US White Christmas Holiday period (like he did successfully forecast a couple years back -see below - like he said a pretty bold forecast once again!

"Now in case you did not see the video, the statement made on Thanksgiving was that 50% of the US would be covered with snow Christmas plus or minus 2 days. For me to verify I need one of the days 23,24,25,26,27 to have 50% coverage. Since the average is more like 33% that is a bold forecast. Last time I pulled this was 2010, said 50% from Nov 26 and it was 50.3% ( a couple of days later, more)"

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Looks like a very interesting pattern setting up for December - I see JB is going for another of his majority of the US White Christmas Holiday period (like he did successfully forecast a couple years back -see below - like he said a pretty bold forecast once again!

"Now in case you did not see the video, the statement made on Thanksgiving was that 50% of the US would be covered with snow Christmas plus or minus 2 days. For me to verify I need one of the days 23,24,25,26,27 to have 50% coverage. Since the average is more like 33% that is a bold forecast. Last time I pulled this was 2010, said 50% from Nov 26 and it was 50.3% ( a couple of days later, more)"

yeah he posted this on twitter:

A8ywoOdCcAAFqv9.jpg

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IMHo, two reason why first 2 weeks of dec are gonna blow. 1st. The storm yesterday was modelled to cut and be a huge -nao which would try and offset the pacific. That obviously didn't happen

2nd, MJO a week or so go was progged to have decent tropical activity in phases 8-2 to help shift the regime in the pacific. Now the mjo may weakly get inot one of those phases but then goes back into the COD. So you have to then rely on another driving force to change that pattern.

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IMHo, two reason why first 2 weeks of dec are gonna blow. 1st. The storm yesterday was modelled to cut and be a huge -nao which would try and offset the pacific. That obviously didn't happen

2nd, MJO a week or so go was progged to have decent tropical activity in phases 8-2 to help shift the regime in the pacific. Now the mjo may weakly get inot one of those phases but then goes back into the COD. So you have to then rely on another driving force to change that pattern.

Yep...One positive I am seeing is possibly the emergence of a +PNA by the 8-11th period... That would be big.

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Yeah, and then delayed Dec 6-12. Now, I got nothing.

The mjo, is mucking everything up. Im hoping for an ncep progression, but i know its not the most accurate. The euro euro ens just do loopties in the cod and around phase 8-1. I think once we get that goa low out of the way, things should start trending better even if the mjo is in the cod. If that were the case the other forcing mechanisms like the ao,nao,pna, should play a bigger role... a neutral pna, with -epo,neutral to slightly -nao, and -ao is a decent pattern and def offers hope for some wintry weather in parts of the region. The mtn torque though is not offering much help for a meridonal flow

gltaum.90day.gif

NCPE_phase_21m_small.gif

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Tom, great points about the MJO. It's under performing these past few weeks when compares to it's forecast.

Anyhow, seems as if we're goin suffer some cutters till mid month at least*. Key thing we might have to watch is the GOA low in the upcoming week or so. Gfs wants to break it down. Also, a -EPO with a -NAO would be money.

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Tom, great points about the MJO. It's under performing these past few weeks when compares to it's forecast.

Anyhow, seems as if we're goin suffer some cutters till mid month at least*. Key thing we might have to watch is the GOA low in the upcoming week or so. Gfs wants to break it down. Also, a -EPO with a -NAO would be money.

i know people hate cutters, but they often lead or start the evolution for a -nao

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I for one am in favor of the delay as long as its not completely denied. I'd much rather have it cold Dec. 15-30 than the 1st-15th. Cold early in December can easily get wasted as its often not quite enough to bring major snows. Give me the 2nd half any time......white X-mas all the way.

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I for one am in favor of the delay as long as its not completely denied. I'd much rather have it cold Dec. 15-30 than the 1st-15th. Cold early in December can easily get wasted as its often not quite enough to bring major snows. Give me the 2nd half any time......white X-mas all the way.

yea i completely agree. Down here our avg snowfall isnt affected as much if we miss a month like it is up in sne.

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