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Mid to late February Pattern Discussion...stormy or end of winter?


ORH_wxman

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Yeah sign me up anytime for that lol. Funny how a wiggle here and there means so much as far as snowfall in SNE. I guess that's why we say a pattern looks favorable, but that word does not mean S+.

 

 

There is definitely that perception that "favorable pattern" means "train of KUs." All it takes is one storm, one dumb luck phasing of shortwaves, to have a memorable month. All you can ask for is the longwave pattern to support it moving forward.

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Good stuff guys. Thanks for all the responses.

Some numbers to go along with the height anomalies shown above...

Historical NAO indexes:

1957 10 1.95
1957 11 0.63
1957 12 0.02
1958 1 -1.14
1958 2 -1.64
1958 3 -2.46

1968 10 -1.99
1968 11 -1.11
1968 12 -1.39
1969 1 -1.48
1969 2 -2.20
1969 3 -2.04

The switch in 1957-1958 is consistent.

It's interesting that Oct 68-Jan 69 was historically bad (at least for KBOS). Looks like a decent western-based negative NAO for Jan 1969 on the map posted above. Clearly the negative NAO was not sufficient (and I'm not expecting that it should be).

Some historial AO indexes:
1957 10 0.903
1957 11 -1.380
1957 12 0.828
1958 1 -1.438
1958 2 -2.228
1958 3 -2.522

1968 10 -1.013
1968 11 -2.183
1968 12 -0.783
1969 1 -2.967
1969 2 -3.114
1969 3 -1.582

Again, interesting that Oct 68 - Jan 69 was such a historic ratter.

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Starting to wonder if we see a comeback after this ugly period near the 10-12. All models now even the euro (I just got a better look after I woke up) rebuild the ridge near AK. Not too far off from the GEFS although not as bullish

 

post-33-0-43686600-1359818239_thumb.gif

 

 

Also,on ROundy's site, it shows OLR anomalies remaining thanks to a Kelvin wave replacing the MJO wave.....just means the area near the CPAC may continue active. Notice the IO eventuallyhas suppression until early March. So, we may be looking at more action post 2/15. I hate to make this disclaimer...but this isn't a forecast, but rather thoughts.

 

post-33-0-80948500-1359818373_thumb.png

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Long term does look promising with the possibility of southern stream involvement.  Not too excited about the prospect over the next 7-10 days.   9th-10th looks like a weak clipper type system over NNE to me, followed by a messy system 11th-12th.  After that is when things could break for us as we get some nice ridging out west and the involvement of the southern stream.

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The models are also showing srn stream action for the first time all year after the 12th or so.

 

Lost in all the commotion was your comment awhile back about the action waiting until after the 10th.  By commotion I mean these flizzards we keep tracking.  I think we endure maybe one more rainstorm before things get better as a region.  Could see the "better" still yielding precip type issues in the CP though.

 

Long term does look promising with the possibility of southern stream involvement.  Not too excited about the prospect over the next 7-10 days.   9th-10th looks like a weak clipper type system over NNE to me, followed by a messy system 11th-12th.  After that is when things could break for us as we get some nice ridging out west and the involvement of the southern stream.

 

After maybe the 11th we finally dump the NW to SE pattern in favor of traditional coastals.   Depending on the strength of the cold air they could range from misses to messes.  The GFS cold bias is probably in play here, and that's why I'm not as optimistic as some might be looking at the OP GFS.   Potential cold bias in play, tracks adjust left and it's less interesting for some of us. 

 

Hopefully in the end it delivers snow where it's needed for winter sport longevity and the huge $ vacation weeks.

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Perhaps someone has the stats that prove otherwise but I feel like that GFS stuff has been fixed in recent years - or minimally shows itself in certain patterns only

 

 

Yeah its definitely not the GFS of 3 years ago, that is for sure. Its cold bias has been mostly fixed from both verification stats and also just anecdotal evidence.

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Starting to wonder if we see a comeback after this ugly period near the 10-12. All models now even the euro (I just got a better look after I woke up) rebuild the ridge near AK. Not too far off from the GEFS although not as bullish

 

attachicon.gif00zENS11-15day500mbHeightAnomalyNH.gif

 

 

Also,on ROundy's site, it shows OLR anomalies remaining thanks to a Kelvin wave replacing the MJO wave.....just means the area near the CPAC may continue active. Notice the IO eventuallyhas suppression until early March. So, we may be looking at more action post 2/15. I hate to make this disclaimer...but this isn't a forecast, but rather thoughts.

 

attachicon.gif2013.png

BTW, starting to wonder means entertaining the idea of a possible comeback, it wasn't meant to be skepticle.

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gfs and it's ensembles want nothing to do with a warm-up really. brief cutter but otherwise...no. 

 

 

I'm surprised at how cold they are in the LR....they got even colder than previous runs. They are trying to go full blown -EPO/+PNA out west.

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