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


ORH_wxman

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Yeah I was thinking the exact same thing...Euro gets cutter-happy in the long range and it still got shoved underneath that block. Adjust even just a hair for that bias, and it would be a pretty sweet setup.

What is better for New England?  A block on Southern Greenland?  A Davis Strait to Hudson Bay block?  Couldn't the latter get too suppressive or is the position of the 50-50 more critical in suppression?

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What is better for New England?  A block on Southern Greenland?  A Davis Strait to Hudson Bay block?  Couldn't the latter get too suppressive or is the position of the 50-50 more critical in suppression?

 

 

A lot depends on the time of year and what the PAC is doing...an east based block is usually pretty good if we have an amped up PNA ridge...if we dont, then we often like a west based block like we saw in late Dec 2010 and early Jan 2011 while the PNA was negative.

 

Up into northern Maine, you don't want any strong NAO blocking unless it is east based...for the rest of NNE, its difficult to just paint it broadly. You want a -NAO in NNE, but so much depends on what the PAC is doing to determine how strong and where you want the -NAO to be. Usually uber strong west based -NAOs are no good for NNE. They can hurt SNE too if they are too far SW or strong like we saw in 2009-2010...but def less chance of being skunked on it than NNE.

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I like how next week potentially sets up for something bigger near the beginning of March.

 

 

It really reinforces the west-based block...it turns it into a more classic Atlantic based Davis straight block versus the Hudson Bay rex block from the south.

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A lot depends on the time of year and what the PAC is doing...an east based block is usually pretty good if we have an amped up PNA ridge...if we dont, then we often like a west based block like we saw in late Dec 2010 and early Jan 2011 while the PNA was negative.

 

Up into northern Maine, you don't want any strong NAO blocking unless it is east based...for the rest of NNE, its difficult to just paint it broadly. You want a -NAO in NNE, but so much depends on what the PAC is doing to determine how strong and where you want the -NAO to be. Usually uber strong west based -NAOs are no good for NNE. They can hurt SNE too if they are too far SW or strong like we saw in 2009-2010...but def less chance of being skunked on it than NNE.

Thank you.  I have a fear of strong west based -NAOs after 5 years of living up here.  We are so often on the edge with the coastal systems, although sometimes we score big (Jan 2011 for ex).  I have become a big fan of SWFEs.  But I think a late season block is less likely to be suppressive than a Dec, Jan, early Feb block.  At least I hope so.  I'm in London and India until Feb 28 and I think that period of early March looks very good.  A strong block like that won't go away quickly and when it finally releases it could be accompanied by a big snowstorm and then spring. I vote for that somewhere in Mid March.

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Thank you.  I have a fear of strong west based -NAOs after 5 years of living up here.  We are so often on the edge with the coastal systems, although sometimes we score big (Jan 2011 for ex).  I have become a big fan of SWFEs.  But I think a late season block is less likely to be suppressive than a Dec, Jan, early Feb block.  At least I hope so.  I'm in London and India until Feb 28 and I think that period of early March looks very good.  A strong block like that won't go away quickly and when it finally releases it could be accompanied by a big snowstorm and then spring. I vote for that somewhere in Mid March.

Swfes can easily become torchy cutters without some NAO help.

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This is the GEFS setup for the 2/28-3/1 threat...look at the great Atlantic pattern and the building western ridge. The EC ensembles actually look better than this even.

 

 

Euro ensembles for comparison....this is a bit before the GEFS verification time, but I can't post the 264h EC ensembles from the pay site...however, you can clearly see how favorable the EC ensmebles look even at 240 with a very defined low anomaly moving toward the east due to the juicey southern stream with a big block in place and a building western ridge to keep the amplitude of the whole wave high

 

 

12zecmwfens500mbheighta.gif

 

 

 

 

 

Given the time frame we're talking here, obviously nothing can be said for details and a big storm is not guaranteed, nor is snow even if we do get a big storm, but this is exactly what you like to see right now.

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And last, but not least....roll forward another 3 days and this is what we have:

 

 

f324.gif

 

 

 

 

 

Notice the "ridge-bridge" now between the NAO block and the +PNA...stuffing all the low heights to the southeast. This would be a pretty prime pattern for a cold cutoff somewhere near the EC...but speculation at this point. Euro ensembles are slightly different in the magnitude but the general idea is the same

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Thank you.  I have a fear of strong west based -NAOs after 5 years of living up here.  We are so often on the edge with the coastal systems, although sometimes we score big (Jan 2011 for ex).  I have become a big fan of SWFEs.  But I think a late season block is less likely to be suppressive than a Dec, Jan, early Feb block.  At least I hope so.  I'm in London and India until Feb 28 and I think that period of early March looks very good.  A strong block like that won't go away quickly and when it finally releases it could be accompanied by a big snowstorm and then spring. I vote for that somewhere in Mid March.

 

 

Be afraid, Be very afraid

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