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H5 pattern similarities


Alpha5

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That is not a classic PNA ridge by any means.

We need the GoA low to retrograde farther west towards the Aleutians so that the ridge axis lines up in the classic PNA area over Montana/Idaho instead of moving into the High Plains as the models are currently showing. Very few big snowstorms here have occurred with a 504dm vortex off the BC coastline.

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This is probably a stupid question, but here goes anyway:

The main problem with next week's "storm" is that the -NAO block is too strong/too far south. The GFS shows the NAO increasing to near neutral in the D7-10 range, according to the CPC website. 7-10 days from now would be the approximate time frame of next week's "storm" so why is it still suppressed?

Also, it looks like we're not going to see a +PNA anytime soon. What instances are there of a significant I-95 snow event during a -PNA?

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