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October 2012 Observations & Discussions


earthlight

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I can't recall one either. The hype should really get going in the community if this stuff continues to be shown on the long range guidance tomorrow. The GFS has been pretty good in the medium range over the last couple of weeks, but the GEFS height anomalies have been a little overdone, or at least they were with the last positive height anomaly episode in the high latitudes. That being said, there is both a ridge over Greenland which extends towards the Davis Straight, and another being modeled north of the Aleutians with + anomalies extending even over the pole. So this could get pretty interesting .

Also key is the progression of the trough coming in from the west. Depending on how that trough is oriented and how fast it comes through will highly alter the track of the storm. A negatively tilted trough could help bring in some cold air and maybe wintery weather on the back end before the storm becomes vertically stacked.

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The high latitude blocking progged D7-10 makes this potential even more dramatic. Absolute tanking of the NAO by the end of October. That type of change alone would suggest increased chance of storminess along the East Coast. I think the main question is will we have a run of the mill autumn nor'easter / rainstorm pre fropa or perhaps something much more intense/tropical in nature.

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The high latitude blocking progged D7-10 makes this potential even more dramatic. Absolute tanking of the NAO by the end of October. That type of change alone would suggest increased chance of storminess along the East Coast. I think the main question is will we have a run of the mill autumn nor'easter / rainstorm pre fropa or perhaps something much more intense/tropical in nature.

NAO

nao.sprd2.gif

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The euro is much sharper/more amplified with the Central/Eastern US trough, which is interesting in comparison to the GFS. Both have the tropical system, but it is interesting to see how the amplification of the ridge out west plays into the eventual development of the Central/Eastern US trough and its interaction with the system in the Atlantic.

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The new GFS is a ways farther east with the tropical system -- just an idea of the variance we can see here at this range despite most global models showing something similar on one model guidance suite.

It looks like the change form 12z was a result of the big cutoff to the east getting closer and breaking

down the ridge to the NE. It will probably take several more days for the models to settle on a single

solution. Should be interesting to watch over the next few days.

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It looks like the change form 12z was a result of the big cutoff to the east getting closer and breaking

down the ridge to the NE. It will probably take several more days for the models to settle on a single

solution. Should be interesting to watch over the next few days.

That's pretty much it...and of course Bermuda reels it in. Then the upper trough to the west finally spins up its own strong low. Low predictability with high potential impact.

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That's pretty much it...and of course Bermuda reels it in. Then the upper trough to the west finally spins up its own strong low. Low predictability with high potential impact.

Yeah, the whole pattern is loaded with potential. I am guessing the details will probably come into better focus

once the storm begins the anticipated northward move in a couple of days.

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That's pretty much it...and of course Bermuda reels it in. Then the upper trough to the west finally spins up its own strong low. Low predictability with high potential impact.

With the huge blocking, it's almost a ticking time bomb for some storm to happen. Whether it's a typical strong nor'easter or something more substantial with Sandy remains to be seen.

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With the huge blocking, it's almost a ticking time bomb for some storm to happen. Whether it's a typical strong nor'easter or something more substantial with Sandy remains to be seen.

i know this is amazing blocking. can only imagine the excitement in here if this was two months later and a fresh cold air mass to deal with.

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