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December 27/28 Storm Threat


Baroclinic Zone

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  On 12/22/2012 at 11:38 PM, Brian5671 said:

with no cold arctic high, an inland track makes sense, no?

Surface highs don't really drive low tracks, much of it has to do with the mid levels. In this case, it's all about the mid levels...H5 and above.

Lows will move to the best WAA and PVA (positive vorticity advection) combo.

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The CAD is pretty strong despite this west track...CNE does get a pretty strong hit of snow and ice. The sfc pressure field looks like it wants to develop a secondary sfc reflection south of SNE. We'll have to watch that regardless of the upper levels...because that would create plenty of icing problems at some point. Even the mid-level CAD is pretty impressive though..esp to the northeast.

Lemons out of lemonade for those who are still not expecting a KU.

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  On 12/23/2012 at 4:06 AM, ORH_wxman said:

The CAD is pretty strong despite this west track...CNE does get a pretty strong hit of snow and ice. The sfc pressure field looks like it wants to develop a secondary sfc reflection south of SNE. We'll have to watch that regardless of the upper levels...because that would create plenty of icing problems at some point. Even the mid-level CAD is pretty impressive though..esp to the northeast.

Lemons out of lemonade for those who are still not expecting a KU.

Yeah I agree. You can see some signals that tell me C NE may still be OK. It helps that the storm is already maturing so we're shutting down some of the really strong advective processes which may actually help prevent the torch. You can see the battle being waged in the mid levels.

Also... it is tough to get a surface low up to BGM without getting some kind of secondary reflection hugging to coast to help tug down a bit of BL chill with a northerly ageostrophic drag.

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