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Dec 11-13 MW/Lakes/OV Snow Event?


Chicago Storm

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I don't really find what he said all that inaccurate. Mets do seem to favor consistency in model solutions and the Euro followed by Canadian have been more consistent than the GFS re: this event. Either way, when taking into account their ensembles, it's apparent we're looking at a pretty good spread but with a rough consensus track though the OH Valley.

Yeah, I know that, it's just been that point has been repeated frequently. I agree with what his statement was. The first time I read his post it seemed like he was saying something else, but I don't know anymore.

Either way consistency is the way to go right now.

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It didn't lose the storm, it's just too far south for some. Not going to happen that way, but it's nice to look at for those up us closer to 40N.

Taken at face value, it seems the GFS has a pretty decent snowstorm for St. Louis. Not sure why previous posters are saying it lost the storm.

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The one thing going for a more southern track is that the first s/w (the clipper) does a pretty good job of knocking down the SE ridge. If you look at the 84 hour NAM H5 height contours, they're pretty much zonal, or slightly NW to SE oriented. That to me suggests that the main s/w over Montana would get a change to dig, before having to eject out.

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Here's the mean position at 12z Sunday, with the individual ensemble member positions as well.

2010120700_054_E1_north@america_I_ENSEMBLE_pnm@moy_132.png

A lot of the individual ensemble members are even further north/warmer than the OP EURO solution. Not sure of GGEM ensemble biases, but it's a little discouraging. Means the EURO may not be as extreme an outlier as I earlier thought.

Are the little red numbers the positions of the lows of the different members?

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Just pointing out that a a jet streak amplifying that much , that strong, with good support at h5 would end up a pretty powerful system. What is your take on the set up around that time on the different models

I don't have any hard thoughts or calls, it's too early for someone with no met background to say much that isn't a glorified guess. I think it's apparent we'll be dealing with a potent system, moisture won't be an issue with a strong gulf connection and it looks like some serious cold air being funneled in on the north side, it's a recipe for heavy snow and the nice trowal features showing up on different OP runs confirm as much. Everyone from the ohio valley north is in the game for heavy snow. If I had to for the fun of it make a call, i'd go with NE Missourri to RFD to MKE as my early heavy snow target. I'll also say that if any kind of solid phase transpires, with this kind of gulf connection, we'll be looking at a deadly mid level warm layer pulled into the NE quadrant, something we're all familiar with.

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I don't have any hard thoughts or calls, it's too early for someone with no met background to say much that isn't a glorified guess. I think it's apparent we'll be dealing with a potent system, moisture won't be an issue with a strong gulf connection and it looks like some serious cold air being funneled in on the north side, it's a recipe for heavy snow and the nice trowal features showing up on different OP runs confirm as much. Everyone from the ohio valley north is in the game for heavy snow. If I had to for the fun of it make a call, i'd go with NE Missourri to RFD to MKE as my early heavy snow target. I'll also say that if any kind of solid phase transpires, with this kind of gulf connection, we'll be looking at a deadly mid level warm layer pulled into the NE quadrant, something we're all familiar with.

I should point out that when I say south I think a band will

be a bit south

of what you outlined. running threw LAF but with a more

East to West Orientation. I think you will be on a moderate zone,

and I will be in the left over zone. the compromise right now would

put LAF in the cross hairs.

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