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Feb 8th-9th Potential Blizzard


dryslot

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rollo that image cuts off in OHIO for me , cant see east of that

 

You can grab from Alan's site. It's up.   Roughly though the 0z OP has Bos to Fall River SE 1.5 to 3" or so, GEFS is 1.25 from around the canal SE to about 2" on the tip of the Cape.  Probably some members in there not quite as robust.  I didn't see the earlier runs no idea how this compares.

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You can grab from Alan's site. It's up.   Roughly though the 0z OP has Bos to Fall River SE 1.5 to 3" or so, GEFS is 1.25 from around the canal SE to about 2" on the tip of the Cape.  Probably some members in there not quite as robust.  I didn't see the earlier runs no idea how this compares.

Slight cut back, but not a huge difference between 0z and 18z ensembles(at least for your area)

 

http://raleighwx.americanwx.com/models/gfsensemble/18zgfsensemblep72084.gif

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GGEM also snows most of Saturday. End result is plenty of water. My guess is euro holds serve.

 

I looks to me like:   The NAM is the most discrete/finite grid of the 3, with the GGEM 2nd, and the GFS...a bit of a distant 3rd.  There is going to be a tremendous amount of complexity in handling this thing during the stream contact/phase, between 48 and 60 hours. It is in that time frame that we see the GFS make a rather abrupt and odd jump - it has a sharp N stream trough with an axis in PA, and a southern stream v-max ripping N some 150 naut mile S of ISP, but then ...curiously, at 60 hours, the two have merged some 300 naut. miles ESE of ACK. That's one hell of a 500mb result given these leads.  The GGEM is half way between the GFS and NAM solutions, and interestingly, it is also somewhere in between in its grid.  

 

This statement is NOT to emphasize the more impacting solution, merely for being the more impacting.   But the NAM, despite it's reputation, is a much more fluid union and may own to having superior convective parameterization schemes, which despite it's tendencies for error, that is true.  

 

Personally, it struck me as interesting that the 12z run earlier today had a solution more akin to this 00z; the 18z run appeared to lose a lot of the southern stream component to this, and when it "re"detected that presence in this 00z run, it came back so prodigiously.  It tells me there is a transitive continuity there; when then considering the convective discussion points, it's worth considering this GFS run as in somewhat of an error.  

 

That all said, it's cold and getting colder folks. That in its self could play a role in this, that isn't related to the GFS' odd mid level center jump.

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4 km WRF-NMM and WRF-ARW through 35 hours. Vast differences in how they handle the moist convection and development of the diabatic anomaly. They accurately depict the sensitivity models have in these types of setups. There will be large wobbles for another 24 hours, at least. No solution is off the table yet. 

 

 

post-999-0-32405200-1360213983_thumb.gif

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B.I,  post more in here.

I am happy to be here for a nor'easter...probably still my favorite synoptic storm (tied with Colorado Lows through the Plains), and I have seen some epics already in AK this winter. Glad something is finally happening after another boring winter. Best storm of the year in AK thus far was a 950 hpa flat trough in confluent flow cyclogenesis event which developed into one of the most photogenic marine cyclones I have seen in years. See image.

post-999-0-72108300-1360214444_thumb.jpe

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Someone mentioned the GGEM earlier.  Hard linking the old and new.  It is east some, not a huge amount.  Picked up 5mb strength in the shunt east.

 

978mb is the new 0z.

 

These maps are available on the meteocentre website.  But it's late, for those looking for the differences, here you go.   Hard-linked so they won't change.

post-3232-0-69567800-1360214614_thumb.gi

post-3232-0-05280100-1360214620_thumb.gi

post-3232-0-66141300-1360214763_thumb.gi

post-3232-0-84120800-1360214769_thumb.gi

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I am happy to be here for a nor'easter...probably still my favorite synoptic storm (tied with Colorado Lows through the Plains), and I have seen some epics already in AK this winter. Glad something is finally happening after another boring winter. Best storm of the year in AK thus far was a 950 hpa flat trough in confluent flow cyclogenesis event which developed into one of the most photogenic marine cyclones I have seen in years. See image.

 

Yeah, the confluence N of the system forced it to roll into itself, transforming an open wave into a closed one, but when that happens, there is a lot of momentum that has to be conserved, so when it curls in it gets exotic. 

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