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


Chicago Storm

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Yeah, that's the one. You phase that with the main s/w, close of an 500mb center, and you got a better shot of wrapping the sfc low back to the NNW, rather than N/NNE like the NAM's showing now.

I shall be pulling for you on this one...probably somewhat of a long shot, but we'll hope. And I shall be rooting on my snow showers/flurries on the back end for here. Gotta salvage something from this cluster...

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Positive feedback cyclogenesis looking even more likely now. If the NAM southern stream shortwave intensity is true combined with a continued trend for more low level cold air...the intensity trend may actually continue still beyond this run.

I was going to post earlier in the day, but had a very important post-early shift nap to get to. I'm glad someone brought this up. A few of the 12z models indicated this type of cyclogenesis by developing a jet streak northeast of the progged surface low. As you very nicely explained, the atmosphere was trying to establish a balance between the low level convergence by developing an upper level jet streak and associated divergence. This feature helps to validate the northern tracks.

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[captain obvious] With that much inland penetration (and associated increased wind speeds), you would expect to lose some of the organized intensity associated with a concentrated single band event. [/captain obvious]

That's what usually happens but other factors (if they're very good) may be able to compensate to some extent.

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I shall be pulling for you on this one...probably somewhat of a long shot, but we'll hope. And I shall be rooting on my snow showers/flurries on the back end for here. Gotta salvage something from this cluster...

We'll still have a sliver of hope when the 00z UKMET takes it through IND.

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