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Winter 2015-16 Medium-Long Range Discussion


OHweather

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our January window is closing fast according to the euro....

 

That's ok, looking forward to our rock'n Feb that everyone has been pointing to since November.   :pepsi:

 

 

our January window is closing fast according to the euro....

 

That's ok, looking forward to our rock'n Feb that everyone has been pointing to since November.   :pepsi:

That's one really extended Pac Jet!  According to HM, the jet extension is the result of a huge East Asian mountain torque event.  He is expecting a more typical El Nino temp anomaly pattern from late this month into the first third of Feb.  HM is banking on a better PNA setup & possibly a -NAO returning by mid Feb. 

post-1943-0-49331600-1452789089_thumb.jp

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Update from the AER on the state of the AO and stratosphere. At least on the 11th, a SSW is predicted to take place the last week of the month and weaken the rest of the elongated stratospheric vortex.

 

 

 
  • The AO is currently strongly negative and is predicted to remain negative over the next two weeks.
  • The negative AO is reflective of positive pressure/geopotential height anomalies over the entire Arctic basin.  The mid-latitudes are dominated by negative pressure/geopotential height anomalies, including the Eastern United States, Northern Europe and East Asia. This is a significant weakening of the strength of the polar vortex in in the troposphere, a southward displacement of the Jet Stream and an overall colder temperature pattern.
  • Initially across western Eurasia the coldest departures from normal are across northeastern Europe.  However during the course of this week the models are predicting for the cold air to spread west across Western Europe and linger for the next two weeks as the North Atlantic Oscillation (NAO) is predicted to follow the AO into negative territory.  Across East Asia temperatures are cold and is predicted to persist into the foreseeable future.
  • Across North America one Arctic outbreak is currently spreading form the Plains to the East Coast and a second Arctic outbreak is predicted for next week across central North America.  Temperatures along the East Coast of the United States looks to remain variable as the storm track becomes more active across the country.
  • One strong pulse of energy transfer from the troposphere to the stratosphere just before the holidays has perturbed and stretched the polar vortex, which has helped to initiate the cooling across the mid-latitudes.  A secondary pulse of energy last week has helped to maintain the elongated orientation of the polar vortex and we continue to anticipate even further energy transfer.  The models are now coming into better consensus for a stronger pulse of energy transfer beginning next week that is predicted to initiate a sudden stratospheric warming (SSW) at the end of the month.
  • The overall negative AO and the elongated polar vortex favor cold temperatures in the middle of the continents including Siberia and the Plains of North America while and active storm track and vertical energy transfer favor more variable and seasonable temperatures in Western Europe and the United States East Coast.

 

 

https://www.aer.com/science-research/climate-weather/arctic-oscillation

 

GEFS plot of the AO from the 11th.

 

Figure1aj.png

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Update from the AER on the state of the AO and stratosphere. At least on the 11th, a SSW is predicted to take place the last week of the month and weaken the rest of the elongated stratospheric vortex.

https://www.aer.com/science-research/climate-weather/arctic-oscillation

GEFS plot of the AO from the 11th.

Figure1aj.png

This is good news for some.

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post-1943-0-88103700-1452796848_thumb.jp
 

Here are the two trop-strat energy transfers Cohen is talking about.  The transfer circled on the left is the one that occurred before the holidays and the transfer on the right (0z GFS modeled) is what is expected to occur within the next few weeks. 

Update from the AER on the state of the AO and stratosphere. At least on the 11th, a SSW is predicted to take place the last week of the month and weaken the rest of the elongated stratospheric vortex.

 

 

 

https://www.aer.com/science-research/climate-weather/arctic-oscillation

 

GEFS plot of the AO from the 11th.

 

Figure1aj.png

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check out the 12z euro for next weeks storm.   Cuts off the low around Houston and takes about 3 days to move a precip bomb from there to the Carolina coast.   Nice HP over the lakes the whole time but no cold sector precip.  

 

what happened to fast flow being our problem...lol

 

 

was just about to post it, a face only a mother could love

 

:lmao:

 

ecmwf_z500_mslp_us_10.png

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check out the 12z euro for next weeks storm.   Cuts off the low around Houston and takes about 3 days to move a precip bomb from there to the Carolina coast.   Nice HP over the lakes the whole time but no cold sector precip.  

 

what happened to fast flow being our problem...lol

There is no cold sector

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check out the 12z euro for next weeks storm.   Cuts off the low around Houston and takes about 3 days to move a precip bomb from there to the Carolina coast.   Nice HP over the lakes the whole time but no cold sector precip.  

 

what happened to fast flow being our problem...lol

Luckily, no ensemble support.  The ensembles actually sort of support the 12z GFS :lmao:  Also the Euro control is heart-break track up I-71 for us.

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The GFS doesn't make any sense. Its disorganization in its handling is seen at 120 hours and continues onward. I think the Euro's point is the models need to relax the heights and go more zonal. You aren't going to get any meaningful system with a PAC flow like that.

Yeah, but I also have a hard time seeing a slow rolling cut-off low like the Euro operational depicts.

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Yeah, but I also have a hard time seeing a slow rolling cut-off low like the Euro operational depicts.

 

:weenie: euro ens look really good for our neck of the woods.  General track is along the lower TN valley with an inverted up into the OV and then a secondary popping off the coast.   The individual members show a bunch of nice hits right up the river valley, also a few north of that and many more south.  The most likely miss looks like it would be because of suppression  vs. cutting north,  which seems odd considering the euro starts to get the AO and NAO to neutral at that point.   

 

Have to wonder if the ggem is on to something with an ice threat for part of the sub considering the strength of the cold coming in late weekend and early next week.  No easy way for that cold to quickly escape.

 

Of course we're dissecting an 8 day euro, so take it for what little it's worth, (but it's all we got too :lol: ) ....it'll change 10 more times but, for the next 10 hours it's an interesting run.

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:weenie: euro ens look really good for our neck of the woods.  General track is along the lower TN valley with an inverted up into the OV and then a secondary popping off the coast.   The individual members show a bunch of nice hits right up the river valley, also a few north of that and many more south.  The most likely miss looks like it would be because of suppression  vs. cutting north,  which seems odd considering the euro starts to get the AO and NAO to neutral at that point.   

 

Have to wonder if the ggem is on to something with an ice threat for part of the sub considering the strength of the cold coming in late weekend and early next week.  No easy way for that cold to quickly escape.

 

Of course we're dissecting an 8 day euro, so take it for what little it's worth, (but it's all we got too :lol: ) ....it'll change 10 more times but, for the next 10 hours it's an interesting run.

Tracks similar to this tend to favor us Ohio guys because they are often prolonged events. I think a big question for next week will be how the temp profiles pan out...

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:weenie: euro ens look really good for our neck of the woods.  General track is along the lower TN valley with an inverted up into the OV and then a secondary popping off the coast.   The individual members show a bunch of nice hits right up the river valley, also a few north of that and many more south.  The most likely miss looks like it would be because of suppression  vs. cutting north,  which seems odd considering the euro starts to get the AO and NAO to neutral at that point.   

 

Have to wonder if the ggem is on to something with an ice threat for part of the sub considering the strength of the cold coming in late weekend and early next week.  No easy way for that cold to quickly escape.

 

Of course we're dissecting an 8 day euro, so take it for what little it's worth, (but it's all we got too :lol: ) ....it'll change 10 more times but, for the next 10 hours it's an interesting run.

I'm not digging this one yet. But I don't totally hate it either. I'm glad the op doesn't have much /if any ensemble support but a solution like that...a cut off moving by to the south with no cold...would just be so fitting this winter :lol:

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