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Late Feb/March Medium/Long Range Discussion


WinterWxLuvr
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2 hours ago, GaWx said:

Absolutely. He’s done this in the past in giving early hints about a warm winter forecast only to backtrack by trying to find a reason to go colder or at least sow doubt about warmth. When was the last time he went warm throughout the E 1/3 of the US and stuck with it? I can’t even recall anything resembling that. His cold bias for the E US is awful.

2008 

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3 hours ago, WxUSAF said:

I’d bet my retirement that 95-96 will be one of his top analogs

 Yep, 95-96 would be an obvious bet for him if the PDO were to switch to positive just like that La Niña winter’s PDO switch. And then if he were to give up on the PDO switching, he could still fall back on 2010-1 with its strong -PDO Niña. Got to keep business going strong!

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8 minutes ago, GaWx said:

 Yep, 95-96 would be an obvious bet for him if the PDO were to switch to positive just like that La Niña winter’s PDO switch. And then if he were to give up on the PDO switching, he could still fall back on 2010-1 with its strong -PDO Niña. Got to keep business going strong!

The best is when in a Nina like 2018 he uses a bunch of analogs like 2001 and 2011 that missed our area with snow but he predicts above normal snow here anyways. 

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23 minutes ago, GaWx said:

 Yep, 95-96 would be an obvious bet for him if the PDO were to switch to positive just like that La Niña winter’s PDO switch. And then if he were to give up on the PDO switching, he could still fall back on 2010-1 with its strong -PDO Niña. Got to keep business going strong!

Weenie post warning:

Well if we go with a 2010-11 analog, maybe that boxing day redux would be a hit for our forum instead of a heartbreaking miss. 

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4 hours ago, psuhoffman said:

@Jitodays weeklies sped up the progression by about 48 hours. Not shocking as guidance took a turn yesterday. It’s almost back to where it was 5 days ago. Not quite, still maybe 1-2 days slower than a week ago. 

 

Yes, it’s good to see the progression moving back up in time on the Euro Weeklies today.

They have been persistent for several days in holding the good look for the last couple of weeks of March.

What do you think that we need to look for in the coming days to have a better idea if this pattern actually has a solid chance this time or if it will be another head fake?

IMG_5363.png

IMG_5364.png

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41 minutes ago, Blizzard of 93 said:

 

 

Yes, it’s good to see the progression moving back up in time on the Euro Weeklies today.

They have been persistent for several days in holding the good look for the last couple of weeks of March.

What do you think that we need to look for in the coming days to have a better idea if this pattern actually has a solid chance this time or if it will be another head fake?

IMG_5363.png

IMG_5364.png

Hard to say since last time it got all the way to day 7 before a spectacular collapse.  Last time the trouble started imo with changes in the pacific. It started to develop a ridge in the central pacific which shifted everything north and east and disrupted the whole downstream pattern. But we already have that ridge now. I guess if we see signs it won’t actually weaken or quickly redevelops that would be the dagger. 

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 Now I see that he appears to be getting the +PDO forecast idea from the WB CFS SSTa prog for Nov. based on 10 days of runs with a 1981-2010 base: look how cold it has the IO, the area between Japan and Hawaii, the S Pacific from E of Australia out several thousand miles, the strip from off the SE US to the N Atlantic, and the SW Atlantic to just off S. America. These 5 areas are mainly BN with coldest of -2 to sub -3! Then note the warmth off W N. America with as warm as +2 off Baja. That does look like a moderate +PDO being progged on the WB map for Nov:

IMG_9284.png.b55344b9c989a3f1dd9e129289049248.png


 But compare the WB prog to TT’s CFS SSTa for Nov. (below), which is based on 3 days of runs with a 1984-2009 base: the IO’s coldest is -1.2 (vs -WB’s -2) and the other 4 areas areas are mainly warmer than normal with much of it +0.8 to +2.5 (vs WB’s mainly BN with coldest of -2 to sub -3)! In addition, the area off Baja that has its warmest of +2 on WB is only +1.0 at its warmest on the TT map and is cooler than most of the area from there to off Japan, making it a -PDO being forecasted on the TT Nov map:

IMG_9286.thumb.png.80b6482d16a38202d23f83c2fcecc020.png
 

How can they be so different? Any opinions? The bases aren’t that different and I don’t see for relatively stable SSTa’s how 10 days worth of runs would make much difference vs 3 days of runs. I think the main problem may be with WB’s algorithms.

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8 hours ago, GaWx said:

Absolutely. He’s done this in the past in giving early hints about a warm winter forecast only to backtrack by trying to find a reason to go colder or at least sow doubt about warmth. When was the last time he went warm throughout the E 1/3 of the US and stuck with it? I can’t even recall anything resembling that. His cold bias for the E US is awful.

1840637863_December_2016_February_2017_Final(1).png.2f43c8e79080e1d495dcdeb04e4a2ead.pngDecember_2017_February_2018_Update2.png.3c05cade0121dc074f0d39f58939213c.pngheart_of_winter.png.11e5d8eb4eed01d961d238d33fe7be05.png

December_2019_February_2020_Forecast.png

December_2020_February_2021_Forecast_Final.png

November_2021_March_2022_Forecast.png

November_2022___March_2023_Forecast.png

November_2023_March_2024.png

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3 hours ago, MDstorm said:

 

December_2019_February_2020_Forecast.png

December_2020_February_2021_Forecast_Final.png

November_2021_March_2022_Forecast.png

November_2022___March_2023_Forecast.png

November_2023_March_2024.png

Thank you for the maps!
 

WB results for E 1/3 of US winters:

1. 2019-20: much too cold everywhere

2. 2020-1: excellent Mid-Atlantic to N. Eng to Michigan; too warm SE/TN Valley; much too warm lower Gulf states to Gulf coast 

3. 2021-2: excellent N. Eng to Mich; slightly too cold Mid-Atlantic to Ohio Valley; too cold SE/TN Valley

4. 2022-3: much too cold everywhere

5. 2023-4: much too cold everywhere except only moderately too cold deep SE/pretty close FL


 In summary for these 5 winters:

-never too warm Mid-Atlantic to New England to Michigan to Ohio Valley

-too warm once SE/TN Valley/Gulf coast states

-much too cold most or all areas 3 of 5

-did very well New England to Michigan twice

 

 My source for actual:

https://psl.noaa.gov/data/usclimdivs/

——————————————-
*Edit to include three added later:

2016-7: much too cold everywhere

2017-8: excellent overall/best of the 8; most areas excellent though SE slightly too cold

2018-9: much too cold everywhere except only moderately too cold Mich and only slight misses New England

 

So, updated summary for all 8: 

-good to excellent most of New England to Michigan 4 of 8: kudos!

-too warm one of 8 SE/TN Valley/Gulf coast states

-virtually none of Mid-Atlantic to New England to Michigan to Ohio Valley too warm even once

-combined with much too cold most or all areas 5 of 8 times suggests cold bias

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Thank you for the maps!
 
WB results for E 1/3 of US winters:
1. 2019-20: much too cold everywhere
2. 2020-1: excellent Mid-Atlantic to N. Eng to Michigan; too warm SE/TN Valley; much too warm lower Gulf states to Gulf coast 
3. 2021-2: excellent N. Eng to Mich; slightly too cold Mid-Atlantic to Ohio Valley; too cold SE/TN Valley
4. 2022-3: much too cold everywhere
5. 2023-4: much too cold everywhere except only moderately too cold deep SE/pretty close FL

 In summary for these 5 winters:
-never too warm Mid-Atlantic to New England to Michigan to Ohio Valley
-too warm once SE/TN Valley/Gulf coast states
-much too cold most or all areas 3 of 5
-did very well New England to Michigan twice
 
 My source for actual:
https://psl.noaa.gov/data/usclimdivs/
——————————————-
*Edit to include three added later:
2016-7: much too cold everywhere
2017-8: excellent overall/best of the 8; most areas excellent though SE slightly too cold
2018-9: much too cold everywhere except only moderately too cold Mich and only slight misses New England
 
So, updated summary for all 8: 
-good to excellent most of New England to Michigan 4 of 8: kudos!
-too warm one of 8 SE/TN Valley/Gulf coast states
-virtually none of Mid-Atlantic to New England to Michigan to Ohio Valley too warm even once
-combined with much too cold most or all areas 5 of 8 times suggests cold bias

Not one map shows the i95 corridor ever in yellow lol
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9 hours ago, GaWx said:

 Now I see that he appears to be getting the +PDO forecast idea from the WB CFS SSTa prog for Nov. based on 10 days of runs with a 1981-2010 base: look how cold it has the IO, the area between Japan and Hawaii, the S Pacific from E of Australia out several thousand miles, the strip from off the SE US to the N Atlantic, and the SW Atlantic to just off S. America. These 5 areas are mainly BN with coldest of -2 to sub -3! Then note the warmth off W N. America with as warm as +2 off Baja. That does look like a moderate +PDO being progged on the WB map for Nov:

IMG_9284.png.b55344b9c989a3f1dd9e129289049248.png


 But compare the WB prog to TT’s CFS SSTa for Nov. (below), which is based on 3 days of runs with a 1984-2009 base: the IO’s coldest is -1.2 (vs -WB’s -2) and the other 4 areas areas are mainly warmer than normal with much of it +0.8 to +2.5 (vs WB’s mainly BN with coldest of -2 to sub -3)! In addition, the area off Baja that has its warmest of +2 on WB is only +1.0 at its warmest on the TT map and is cooler than most of the area from there to off Japan, making it a -PDO being forecasted on the TT Nov map:

IMG_9286.thumb.png.80b6482d16a38202d23f83c2fcecc020.png
 

How can they be so different? Any opinions? The bases aren’t that different and I don’t see for relatively stable SSTa’s how 10 days worth of runs would make much difference vs 3 days of runs. I think the main problem may be with WB’s algorithms.

Good question. They aren’t so different in certain domains like ENSO, IO, MC, and even off the US West coast. But in the extra-tropical west pacific they could not be more different. 

I think part of the answer is that the marine heat wave off Japan is an extreme climatological event that is neither reproducible or predictable by any climate model, let alone any seasonal forecasting models. 

Find a way to dissipate that marine heat wave, then maybe we have a chance at colder winters again. 

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13 hours ago, Ji said:


You’ll be back if it’s interesting

Obviously. I’m just saying I’m not looking for it like you are.  I honestly don’t check the models anymore.  I’ll pop in here every or day to see if something is brewing. People can call it reverse psychology or whatever they like, but I’ve shifted into work mode (my busiest period is from now until the primary in June). If we get one last hurrah of course I’ll be in dude.  I’m just not actively searching like you are.  

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26 minutes ago, Terpeast said:

Good question. They aren’t so different in certain domains like ENSO, IO, MC, and even off the US West coast. But in the extra-tropical west pacific they could not be more different. 

I think part of the answer is that the marine heat wave off Japan is an extreme climatological event that is neither reproducible or predictable by any climate model, let alone any seasonal forecasting models. 

Find a way to dissipate that marine heat wave, then maybe we have a chance at colder winters again. 

Is the heat wave located anywhere near where they are dumping all the radioactive water into the ocean?

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10 minutes ago, mdhokie said:

Is the heat wave located anywhere near where they are dumping all the radioactive water into the ocean?

The hottest SSTa of the marine heat wave is almost exactly where, and downstream of, Fukushima, the site from where they are dumping radioactive water. 

I haven’t come across any research that this is the cause, but I can’t seriously believe that this is a mere coincidence. 

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57 minutes ago, Terpeast said:

Good question. They aren’t so different in certain domains like ENSO, IO, MC, and even off the US West coast. But in the extra-tropical west pacific they could not be more different. 

I think part of the answer is that the marine heat wave off Japan is an extreme climatological event that is neither reproducible or predictable by any climate model, let alone any seasonal forecasting models. 

Find a way to dissipate that marine heat wave, then maybe we have a chance at colder winters again. 

  In addition to the extra-tropical W Pac, look at how much colder WB’s CFS map is vs the TT CFS map off the SE US, E of Australia, and in the W Atlantic off Argentina. All 4 of these areas have below normal/blue shades on the WB map and above normal/red shades on the TT map even though they’re both from the same model for the same month (November).

 I agree about the importance of the dissipation of that marine heatwave off Japan.

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40 minutes ago, Terpeast said:

The hottest SSTa of the marine heat wave is almost exactly where, and downstream of, Fukushima, the site from where they are dumping radioactive water. 

I haven’t come across any research that this is the cause, but I can’t seriously believe that this is a mere coincidence. 

This would be an amazing case study dealing with the weather pattern and the heat exchange from the ocean in that area to other areas. Very interesting for sure but what do you do? 

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1 hour ago, Terpeast said:

The hottest SSTa of the marine heat wave is almost exactly where, and downstream of, Fukushima, the site from where they are dumping radioactive water. 

I haven’t come across any research that this is the cause, but I can’t seriously believe that this is a mere coincidence. 

Whoa, whoa hollld up...ya just dropper something there. And it may become a punchline here, lol, but now that ya mention it you can't help but wonder...

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57 minutes ago, Maestrobjwa said:

Whoa, whoa hollld up...ya just dropper something there. And it may become a punchline here, lol, but now that ya mention it you can't help but wonder...

I'm just the messenger. Look at where Fukushima is on Google Maps, and then compare that location against the warmest SST anomalies on those two CFS forecast maps @GaWx above. 

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