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Winter 2014-2015 Thread


Ji

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Some cooling taking shape in the west pac and by the looks of the height patterns next couple weeks it should continue. 

 

The GOA warm anoms are going to be tested coming up as well. The vortex in the bearing sea is progged to move se and keep a large area of lower heights/temps in the goa region for 5+ days. This 5 day mean is interesting. Would support the +PDO to possibly start re-establishing itself but at the same time it would make a dent in the +anoms in the GOA region. 

 

Personally, I don't care about the GOA warm pool nearly as much as having a +PDO going into winter. 

 

post-2035-0-33114100-1410184133_thumb.jp

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Some cooling taking shape in the west pac and by the looks of the height patterns next couple weeks it should continue. 

 

The GOA warm anoms are going to be tested coming up as well. The vortex in the bearing sea is progged to move se and keep a large area of lower heights/temps in the goa region for 5+ days. This 5 day mean is interesting. Would support the +PDO to possibly start re-establishing itself but at the same time it would make a dent in the +anoms in the GOA region. 

 

Personally, I don't care about the GOA warm pool nearly as much as having a +PDO going into winter. 

 

attachicon.gifpac5daymean.JPG

 

Interesting, although that looks scarily similar to the current CPC forecast for DJF....which would be bad, right?

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Interesting, although that looks scarily similar to the current CPC forecast for DJF....which would be bad, right?

 

El Nino's generally have low pressure in the NE pac region through the season. It's a classic feature of mod nino's. In that type of config we live and die by blocking. We need the polar jet to be displaced by a -ao/nao. 

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+PDO is best for east coast, correct?

 

for DC metro, yes..I can't speak to 40N, though it is undoubtedly less of a factor for them..we are about twice as likely to get a big snow winter with a +PDO than a -PDO...doesn't mean we can't get a big winter with a -PDO, but we need a great atlantic to do it....here is the composite of big -PDO winters since 1950...there have been 5.

 

post-66-0-20094400-1410193820_thumb.png

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1) Of course, the CFSv2 for this Oct. could be totally wrong.

2) If it turns out to be pretty close to reality (warm Oct.), consider these seven years (three of them, 1900, 1939, 1963, being non-strong El Nino) that had a warm Oct. and a chilly to very cold winter (idea is that correlation between Oct. and DJF not strong):

 

1900, 1939, 1962, 1963, 1995, 2010, and 2013

 

Warm October:

post-882-0-17893200-1410194432_thumb.png

 

Followed by cold winter:

post-882-0-03462200-1410194478_thumb.png

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1) Of course, the CFSv2 for this Oct. could be totally wrong.

2) If it turns out to be pretty close to reality (warm Oct.), consider these seven years (three of them El Nino) that had a warm Oct. and a chilly to very cold winter (idea is that correlation between Oct. and DJF not strong):

 

1900, 1939, 1962, 1963, 1995, 2010, and 2013

 

Warm October:

attachicon.gifWarm OctPrecedingColdDJF.png

 

Followed by cold winter:

attachicon.gifColdDJFFollowingWarmOct.png

Good point

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Why would folks want a colder than normal October? We aren't getting snow in October down this way. If it wants to be warm and pleasant as the leaves turn, fine by me.

 

The only thing we should care about during october (other than enso/pdo status) is the rate of snow cover increase in siberia. I hope all the snow and cold is locked up there the whole month and we roast. 

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New Euro (seasonal) looks colder than average, with a fat ridge over the Arctic and Alaska, but weaker with the -NAO. Also a big negative over/south of the Aleutians, as is typical of a Niño.

SNE Dream scenario then lol. We just need to wait until we get closer. Anyways I want a warm October thru maybe Thanksgiving.
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It's not a temp anomaly forecast. It's just a probability forecast for above/below normal temps, so it can't "verify," per se.

The temperature/geopotential height anomaly forecast looks very odd on both the Euro Seasonal and the CFS. Euro seasonal has +anoms from AK, to CA, to FL, to ME, to the Pole. Hard to imagine how that could occur.

Euro seasonal is going for a 2006-07 redux in some respects. There seems to be a consensus on a persistent -AO/+PNA/+NAO type look in the ensemble mean, with a stronger than avg STJ.

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