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


Chicago Storm

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  On 12/11/2010 at 9:52 PM, Indystorm said:

Well, when you now have a tor watch for this evening in central Mississippi with temps there at 70 and dews in the 50's I can only expect the snow side of the storm to be intense and exciting as well per moisture and dynamics.

any concern that severe strong storms hamper moisture feed further north?

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  On 12/11/2010 at 10:00 PM, Indystorm said:

Doesn't look like it per radar....strong moisture fetch into our storm. WV loop impressive.

Usually you need a pretty decent sized sqauline/TS complex in order to cut the flow of moisture off to the Cold end of the Precip....

I think the strength/dynamics/moist transit isn't a problem with this one...

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  On 12/11/2010 at 9:57 PM, buckeye said:

any concern that severe strong storms hamper moisture feed further north?

I mentioned this last winter on the old message board, but studies have shown that it depends on the orientation of the convection. The convection can create an internal potential vorticity anomaly (which induces a counter-clockwise circulation in the atmosphere). If the convection is oriented north-south, that can increase the moisture transport by way of strengthening in the LLJ. If the convection is more southwest-northeast in nature, that can shunt the moisture away from the def zone/trowal features.

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