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December 2013 obs and discussion


Ian

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Why does it seem like in the past couple of years there is always a low in lakes to mess things up.

Matt hit on the main reason.  We've been in a La Nina pattern which usually is a negative PNA pattern that has the ridge out in the Pacific which keeps trofiness in the west and a southeast ridge so storms tend to track towards the lakes.  Even those times that the ridge shifts into the west, we tend to have such a dominant northern stream that shortwaves dive southward across the lakes and there is low pressure even if we get some southern stream energy involved.  For snow we want a storm off the Carolinas with high pressure over the Lakes not low pressure. 

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