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December pattern/forecast thread


weathafella

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Seriously into the weather, no hype and damn he knows stuff. his web site is off the hook great for links and I highly recommend a follow.

crankyweatherguy

@crankywxguy

I do weather stuff. I don't do weather hysterics stuff. I don't craft my feed to support any particular kind of weather. What comes, comes, and we shall follow.

http://www.stormhamster.com/wall.htm

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19 minutes ago, Baroclinic Zone said:

No more SREF posts.

lol I kid. But remember in Jan 15 how the Euro ENS were alone with showing a heavy swath of snow across NE and it kept increasing as we got closer. That is what I use snow maps for, just a tool in the mean. The OP runs snow maps are pretty lame for sure especially beyond a day or two. Ens mean snow maps are part of the tool bag when trying to get a grasp on pattern evolution. Its easy to see how things may evolve 

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there is one take away from cold with no snow ... if it's syrupy cold, the ocean is fantastic on clear mornings.  you get that micro-layer explosive parcel lift, in the form of 'sea smoke.'  when back-lit, it's a mesmerizing visage.  sometimes, 'steam dogs' piller their way across the surface, sometimes rotating around one-another like Fuji Wara semi-translucent 'nados.  i've actually seen steam dogs sinuously rope into the sky some hundred foot or more in between plumes of luminescence.  the wind has to be light, and the air temperature and dew points need to be sufficiently differentiated wrt to the sea-surface.  i'm sure it can happen at any temperature, but there's something about it when it's like 4 F 

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again... we start threads for clawing and scraping events...  we should start one for the D4.5 to 5 er.   as i was saying yesterday, that one has the best shot yet at a bona fide synoptic snow.  not that these others aren't, but when the snow fall can't even fend off a feeble December sun the following afternoon ...somehow it doesn't 'feel' like it should count (childish, i know :) ). 

as other's have certainly mentioned, this one has a deeper antecedent cold.  one thing that's assisting a whiter solution is the speed of system translation; it's moving so fast that there really isn't enough time for warm advection to erode/penetrate. you get the ib pulse/snow burst, then some freezing snitzels...then the back side cold shot flows in.  

it's true that the euro has been warm-ish with that, but, considering that three runs ago it took the deep layer over Michigan and now...over or south of the sne means that it's the trendy model.  the gfs has been pretty stoutly fixed on a 'sw flow' isentropic type of event.  the 12 memebers of the ensembles that i've seen have all had some for of this, too.  seems the onus is on the euro to put up or shut up. 

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i like the 'nickle -dime' event modeling trends. we seem to have found our way into a pattern for it. thus deep negatively tilted stemwinder tropospheric torque jobs were not a very good fit, either logically or intuitively, against the back-drop flow compression (for the newbie, flow compression ...we mean an abnormally large amount of the lines on the 500 mb weather maps). the models seem to have gotten away from that as of late.  it sort of lend confidence because the impulse type and frequency doesn't offend anything.  that and the consistency of the operational gfs for D 5.  no problem with a 4" type solid advisory growing in probability...

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i'm impressed by the cold despite the at times 585 dm heights from TX-FL...  again, that's all imposing a mammoth gradient from s to n over the midriff latitudes of the continent. the erstwhile epo has been subtly negative .. it seems that one way or the other, cold has been transmitted into Canada off that indicator's physical manifestation. you almost wonder if 'something's gotta give'... or not, maybe we're stuck with super fast balloon rides all winter.  who knows.  but one thing is for certain, with the flow being so fast ...so, if and when we get proverbially boned, we don't have to wait long until the next dice roll... sometimes you get on negative streaks at the casino, sometimes you get on positive ones too.  such is life living on the gradient its self. 

in the meantime, the 10-d canadian ensemble product is still putting up some impressive negative sd's over almost all of Canada.  

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Just now, WinterWolf said:

Where was that quote...was it erased??  I didn't see that anywhere on here?  I like the sound of it though. :-)

One of the issues with mobile is sometimes you can't erase quotes you don't want to use so I went with the flow and read Kevin's mind.

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I can't post them here, but the euro tropical forcing stuff really does not argue (at least IMO) for a breakdown through the 20th or so. Now perhaps it weakens a bit...afterall you ca't keep sub 500 thicknesses around forever...but for now...I don't see a full fledged pattern breakdown through 2 weeks or so. I should stress...that does not mean it's always cold and snowy.  

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1 minute ago, CoastalWx said:

I can't post them here, but the euro tropical forcing stuff really does not argue (at least IMO) for a breakdown through the 20th or so. Now perhaps it weakens a bit...afterall you ca't keep sub 500 thicknesses around forever...but for now...I don't see a full fledged pattern breakdown through 2 weeks or so. I should stress...that does not mean it's always cold and snowy.  

Right.  We all read it, you are guaranteeing a white Christmas for all of New England.

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6 minutes ago, CoastalWx said:

I can't post them here, but the euro tropical forcing stuff really does not argue (at least IMO) for a breakdown through the 20th or so. Now perhaps it weakens a bit...afterall you ca't keep sub 500 thicknesses around forever...but for now...I don't see a full fledged pattern breakdown through 2 weeks or so. I should stress...that does not mean it's always cold and snowy.  

No, but in the waffling back and forth you would think there would be some more chances for wintry precip around

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14 minutes ago, OSUmetstud said:

It's the two waves from the looks of it.  I think that's the way to get it done...one wave ends up blowing it up and warms most up.  

yeah, ...not that anyone asked, but ... i was opining the idea a while ago that single systems are not favored in this flow type either - it's too fast everywhere. really going smeared out is the path of least deterministic regret i think - ... 2 wave or general isentropic lift spanning awhile is support as well.

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21 minutes ago, CoastalWx said:

I can't post them here, but the euro tropical forcing stuff really does not argue (at least IMO) for a breakdown through the 20th or so. Now perhaps it weakens a bit...afterall you ca't keep sub 500 thicknesses around forever...but for now...I don't see a full fledged pattern breakdown through 2 weeks or so. I should stress...that does not mean it's always cold and snowy.  

Again, wouldn't be wholly shocking if models tried to rush the pattern out the front door. Like you say, we haven't created a new home for the polar vortex, but a snapback to banana hammocks shouldn't be all that likely either.

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