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December 24-25 Snowstorm


Jim Martin

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I think officially the "block" is that Greenland ridge, but the downstream Atlantic vortex which the Greenland ridge locks in place is the more direct problem for us. I tend to refer to both features as the "block".

Makes sense, thanks. Just shows that it's tough to get a snowstorm because the block has to be east based and in the right place or else the lows will track like they did in november. Makes you appreciate the snow more when it does come. Just a quick newbie question regarding the NAO. When it is east based does that mean it's more likely neutral to positive? Or can it still be strongly negative and east based?

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Through 72 the Euro is a little slower than the GFS, also maybe a hair farther north with the 500 and it's closed off.

From tombo:

hr 78 h5 low still closed off over se ok/north central tx..sub 1016 low south of dallas...lgt precip iowa to tex mod precip eastern tx and ok

hr 84 h5 low closed off over dallas mod precip eastern tx and eastern ok...lgt precip missouri ks south

hr 90 still has a closed h5 low where 0z opened it at this time....mod to hvy precip ark south...some lgt precip up to st louis northern stream starting to dfive in

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Through 72 the Euro is a little slower than the GFS, also maybe a hair farther north with the 500 and it's closed off.

From tombo:

hr 78 h5 low still closed off over se ok/north central tx..sub 1016 low south of dallas...lgt precip iowa to tex mod precip eastern tx and ok

hr 84 h5 low closed off over dallas mod precip eastern tx and eastern ok...lgt precip missouri ks south

hr 90 still has a closed h5 low where 0z opened it at this time....mod to hvy precip ark south...some lgt precip up to st louis northern stream starting to dfive in

Does the Euro show any precip getting into S. Illinois?

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