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Moving Through December - Changing Patterns and Changing Diapers


ChrisM

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I would think we will see next weeks storm continue to cool as we move thru this week. Already signs of CAD on some modeling

There is, but CAD does not automatically mean ice. We'll need a chilly antecedent airmass...just not sure how much there is to work with, but it is early. The 06z GFS actually was decent ice for areas near the NH border.

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There is, but CAD does not automatically mean ice. We'll need a chilly antecedent airmass...just not sure how much there is to work with, but it is early. The 06z GFS actually was decent ice for areas near the NH border.

Scott, don't we want this system to cut well west to help establish a west based -nao?

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The modeling has been trending less and less with the effectiveness of the NAO. Looks like this whole process is happening quicker and may mean I will be wrong about New England mid-December. But, I'm not throwing in the towel just yet.

I will continue to stress caution on any -NAO solutions through the end of December. Support for a legitimate -NAO starts building as we move into January.

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The modeling has been trending less and less with the effectiveness of the NAO. Looks like this whole process is happening quicker and may mean I will be wrong about New England mid-December. But, I'm not throwing in the towel just yet.

I will continue to stress caution on any -NAO solutions through the end of December. Support for a legitimate -NAO starts building as we move into January.

It's a pretty weak sauce -NAO on the ensembles. It's always had a transient look and one that could weaken...if you know what I mean, and it's more east based.

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It's a pretty weak sauce -NAO on the ensembles. It's always had a transient look and one that could weaken...if you know what I mean, and it's more east based.

The La Niña pattern coming up has the look of Will's composite map that featured snowy Decembers for New England. So there is no way I'm giving up yet for you guys. Down my way, we are punting...and probably Jets Style. :(

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There is, but CAD does not automatically mean ice. We'll need a chilly antecedent airmass...just not sure how much there is to work with, but it is early. The 06z GFS actually was decent ice for areas near the NH border.

Yeah that's why I said we still have some work to do but we like the colder and colder trend and think it will continue to some degree
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The La Niña pattern coming up has the look of Will's composite map that featured snowy Decembers for New England. So there is no way I'm giving up yet for you guys. Down my way, we are punting...and probably Jets Style. :(

Yeah I followed up with my last post saying it's still in a position to help us...just gotta keep that feature persistent on the models. It's definitely a pattern that has delivered, but Will had a good analogy saying how we are on the knife's edge..and I agree. The one thing I did like on the ensembles, was how the mass fields tries to show areas of subtle low pressure to our south. To me, that meant probably some overrunning deals or SWFE type possibitlies at the least. Of course we all know the caveats of models that far out...but just sayin'.

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HM, this msg is for you. I live around memphis tn. I really enjoy this forum. Its a good read from knowlegable mets and weather hobbysts. HM, i noticed you talking about the pattern is almost complete. For the central and eastern US to see a more sustained pattern, would we need to see the pacific ridge to shift further east and or a -nao west based to develop? Lastly, what can we look for in the pattern for that to maybe start to evolve? Thanks kevin.

Almost missed this...

Yes you want to see that ridge come East some from the E PAC and you want the NAO block to be much more assertive / west based than what is being modeled now. In your case, the La Niña-like pattern will certainly make it stormier and you will be closer to the baroclinic zone at times, so maybe you'll get lucky with wave timing!

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