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Feb. 23-25th Winter Storm Potential


Chicago Storm

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Fortuantely the models are sorta/kinda in their zany range (when they start spitting out crazy solutions) and the energy hasn't been fully sampled yet, so it's hardly time to wave the white flag yet if you're along and in between the DSM-MKE-MBS corridor and the EVV-LMK-PIT corridor.

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So what needs to happen for colder air to move in?

models have lowered mid level and surface temps for this here dramatically.

but they are not quite there..I guess it will take a more wrapped up system that travels a bit south of me.

You're probably going to need some type of phasing, which isn't shown on any of the models really. This is pure southern stream.

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Will be curious to see what the Euro ensembles have to say. Until then, we have the GFS ensembles. Several members seem to be a least a little north of the op run.

f60.gif

f72.gif

f84.gif

True, but not as far north as they were 24 hours ago. They've been slowly trending towards the OP. Personally don't think this is instructive of anything, as the GEFS have been horrible this winter.

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The fact that mets are hyping the severe potential up to about kentucky, doesn't that indicate that this storm will be pretty strong, thus the further suppressed and se tracks are more unlikely? Anyone have a graphic of the NAO? Thanks

It'll be firmly positive, although transitioning.

nao.sprd2.gif

Like b_i said, sometimes the overall pattern can argue for a more amplified solution but if the initiating piece of energy is weak enough, it won't matter.

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Doesn't seem to be much in the way to prevent a NW trend other than if the low is just too weak. Impressive cutoff of precip though. 1-2 inches from lafayette to indy with only .50 into Se MI. Another nail biter.

There's a front-running northern stream impulse that will tell the tale on how far north this ultimately makes it. Seems the trend on the models is for it to exert a little more influence than originally thought. Still, the zone of all snow is going to be fairly small, as it looks like a pure southern stream event that will be working with relatively marginal cold air.

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Well, if there's going to be one, it needs to start NOW!

I am not so sure this will come back to the nw. This system hits on a euro weak spot and thus Canada etc. Like the GFS/NAM this run has a stronger system across Canada as well and thus sends the confluence zone farther to the south. Thus as well why we have such a sharp cut off on the north side.

Could be just a blip and the euro ensembles could come back and laugh it off. We'll see. This is looking like a LAF etc special. Only real shot left for farther north is that this system has not come on shore yet.

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I am not so sure this will come back to the nw. This system hits on a euro weak spot and thus Canada etc. Like the GFS/NAM this run has a stronger system across Canada as well and thus sends the confluence zone farther to the south. Thus as well why we have such a sharp cut off on the north side.

Could be just a blip and the euro ensembles could come back and laugh it off. We'll see. This is looking like a LAF etc special. Only real shot left for farther north is that this system has not come on shore yet.

Hmmm.. The euro ensembles have held their ground.. A shade drier on the northside though vs 00z run. .50 line runs from IA/IL/MO line ene to South Haven and on over to just north of Port Huron to Toronto. .75+ from near Josh back to a little north of LAF on back to about 50miles south of the IA/IL/MO line.

.25+ line runs from just north of QC to the IL/WI line at the Lake on over to Muskegon to Bay City.

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Looks like IND is biting on the trends. They have "moderate snow accumulations" in the zones for LAF on Thursday night.

Yep. Here's the latest point and click as well:

Thursday Night: Snow likely. Cloudy, with a low around 27. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

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