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Early December Pattern Discussion


Baroclinic Zone

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And at times we've had ridging in nw Canada. In fact, the EC ensembles do try to indicate that, which might...might try to help out near Christmas, but we have a -PNA pattern with a raging +AO. Together, they combine with a stout se ridge. If that ridge happened to be a little weaker, or the AO relaxed a little...we would have had a decent winter. Canada looks like it could get colder after Christmas, so we'll see if that tries to seep south. I'm hoping January tries to get a little better with some SWFE.

Even if it does get cold, we need to start to see more storminess across the country. Its been very dry lately (of course it warms up to rain) but there just aren't a lot of systems moving through. Even if temps are a bit mild, it would be nice to start to see some precip events every few days instead of maybe 1 per week.

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06z GFS doesn't even show much in the way of ice...surface is well above freezing into western Maine. The high slips offshore too quickly and sets up SE flow off really warm SSTs. I don't think this is any more than a rain storm.

I wouldn't expect the GFS to be correct with the 0C line at the surface. There will probably be some mixed precip at first in NNE, but it will likely go over to rain.

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06z GFS doesn't even show much in the way of ice...surface is well above freezing into western Maine. The high slips offshore too quickly and sets up SE flow off really warm SSTs. I don't think this is any more than a rain storm.

Now this will have substantial ice for many in NNE. Euro had that signal as well. I wouldn't base the forecast on the d4-5 off hour GFS.

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Now this will have substantial ice for many in NNE. Euro had that signal as well. I wouldn't base the forecast on the d4-5 off hour GFS.

I disagree that the ice will be substantial. To have a significant ice event, you need the high pressure farther west so you have NE/ENE flow at the surface to counter the strong SW winds in the mid-levels. In this case, the high is way offshore...ice doesn't last very long with SE winds coming from the warm ocean. Will a few high valleys see some minor icing before going over to rain? Probably. But the antecedent airmass and the position of the high argue against a larger ice event.

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I wouldn't expect the GFS to be correct with the 0C line at the surface. There will probably be some mixed precip at first in NNE, but it will likely go over to rain.

Yeah I was just going by climo... in those situations the low mountain hollows and towns will always take a while to scour out the surface air.

Its the same when folks use that product to show why an event will be all rain in SNE but then you, Will, and others tear them a new one saying the models will always scour out the cold too quickly.

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what happened to our cold and snow you kept talking about all fall:(?

I woke up this morning and the sun was gone.

December was never a lock on anything good here. Though my pattern call was off too.

We'll see how January performs. It has always held more promise than December. I haven't had any time to really dive into long range stuff for the last few weeks. I just glance at ensembles. But in the interest of simplicity, I call December dead.

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The GFS at hr 150 looks like it is trying to brew something. That's the potential "threat" in the 18-20 time. But it could be close to a threading the needle event. You have a pretty strong sw US trough with a very cold airmass across se Canada. If the trough in se Canada is too quick in moving out, the storm could go west.

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Cool trolling bro.

Just having a little fun in a ridiculously warm and boring weather pattern thats on month 4, until we can get some sustained ridging up over Greenland with some high latitude blocking its more of the same with one or two day transient cold shots. I think will, scooter, ryan and tippy have laid out the pattern pretty well. Not much to talk about, cant control the weather just have to enjoy whatever comes our way, and next week its rain and a torch.

Happy Festivus

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