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December 27/28 Storm Threat


Baroclinic Zone

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The H5 trough moves ENE and the surface low is captured or hanging with the best PVA and WAA combo which is why is sort of curls up to NYC and then drifts ENE, but that elongation of the isobars is a reflection of pressure falls from strong WAA along the south coast. Part of me thinks perhaps some sort of reflection would be possible somewhere along the south coast, but nothing terribly wrong with the depiction I see at the moment.

Actually at hr 90, the low almost looked like it dumbelled arounf the ULL because the surface low is one the west side of the ULL.

There's enough junk in southern Canada with confluence north of the border to prevent the thing from truly ripping west. Looks like it all stacks and occludes at just the right time.

Still would be a messy storm IMO even farther north than the GFS indicates with a slew of issues ranging from sneaky mid level warmth to dry slotting. But, no doubt, and encouraging run.

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There's enough junk in southern Canada with confluence north of the border to prevent the thing from truly ripping west. Looks like it all stacks and occludes at just the right time.

Still would be a messy storm IMO even farther north than the GFS indicates with a slew of issues ranging from sneaky mid level warmth to dry slotting. But, no doubt, and encouraging run.

Yeah just enough crap there to hang the low up by the south coast.

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That's the stuff where acl injuries are abundant. lol

Still, a promising trend, especially for ski country.

Glaze takes it to another level, ripping thru knee deep crusty snow hurts when you fall it's pretty ugly. But sans the glaze, sleet is not bad at all. Hurts like bastard flying down at 40 though.
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Yeah the GFS is a pants tent for my Killington trip.

I'm still thinking (with my bad luck) that I'll get like 7" of snow then an awful layer of sleet and glaze of ZR making it just a hideous mess.

going later in the week? you may be ok. sleet is still very good skiing, a slight ZR zipper crust is fine, especially if the wrap around works back in. you could always splurge and drive north to S'Bush to milk the upslope machine if it kicks on. k-ton will probably make out nicely if it kicks on- 4" of fluff on a thinly crusted soft, recent flow is not bad skiing at all.

it'll be mostly white, and likely pretty soft and enjoyable skiing. things look pretty damn good for the north country when you take into perspective how awful it looked 5-6 days ago. it's december, and we're in new england... how many washed out ski trips I've had I can't count. even a torch/wash out is still a good time in the mountains. and the forecast looks great, all things considered.

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Killington has had 9 since I promised Ryan 18-24 before he arrived, 9-15 to go, doable.

i'm no met, but the green mountains make lemonade. looked like lemons but a few days ago, and here we go. get after it!

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12z NCEP ensemble EOFs

EOF_4fig_NCEP.gif

Focus on EOF1 ... first of all, the greatest amount of variance explained ... and secondly the SLP pattern is one that we're interested in --> related to the longitude of the track ... a positive EOF1 is exhibited by ensemble members on the eastern side of guidance.

So now look at the sensitivity in the 500mb heights over the next 24 hours. Notice that the greatest sensitivity is actually not over the northeast in the confluence zone as one might expect, but is over the Southeast and Gulf. I think this is related to the idea of compression, and how much shortwaves are allowed to amplify in the flow ... lower heights over Florida allow shortwaves (such as our Christmas system) to dig freely for much longer before nonlinear terms grow leading to cyclonic wave breaking.

SEN_1_NCEP_Z500_0-1day.gif

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Verbatim, That is classic snow track here, Any Coastal that tracks over Yarmouth, NS or Bay of Fundy is a snow maker

Yeah it looks awesome. GFS is also within 50 miles of that track. Longitude FTW has been the rule the last two years. Again it looks like ME keeps snow better than areas to the west at the same latitude.

Edit: Looked at maps. Maybe not coastal ME changes to sleet and rain too.

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