uncle W Posted September 24, 2012 Share Posted September 24, 2012 You're right, 52-53 was only weakly negative. 1951 has been one of my primary analogs through this past summer and it looks like it may be a good one going forward. The august PDO value is more strongly negative than last month, which isn't good news: http://jisao.washing.../pdo/PDO.latest This puts 12-13 closest to 51-52 PDO wise if we have a weak nino. I can see the PDO warming over the next few months, but usually by September we see some indication of reversal, and we've gone the wrong direction. Going to have to hope for NAO/AO magic this year I'm thinking. 1952-53 started out with snow in October, November, early December and New years Eve...A little bit more the first half of January and that was it...There was a big change in the pattern after that...The AO index from Dec-Mar was -1.827, -1.036, -0.249, +1.068...The PDO from Dec-Feb was 0.04, -0.57, -0.07...It was a weak enso but it was a second year weak nino... Link to comment Share on other sites More sharing options...
tacoman25 Posted September 24, 2012 Share Posted September 24, 2012 You're right, 52-53 was only weakly negative. 1951 has been one of my primary analogs through this past summer and it looks like it may be a good one going forward. The august PDO value is more strongly negative than last month, which isn't good news: http://jisao.washing.../pdo/PDO.latest This puts 12-13 closest to 51-52 PDO wise if we have a weak nino. I can see the PDO warming over the next few months, but usually by September we see some indication of reversal, and we've gone the wrong direction. Going to have to hope for NAO/AO magic this year I'm thinking. Well, I know you are knowledgable about solar, and I think you'd probably agree that in that respect, we are probably in better shape for -AO blocking this coming winter than was the case in 1951-52. Some people are not aware that even though the U.S. torched Jan-Feb last winter, much of the NH was quite cold thanks to a very healthy -AO. So I think the tendency is still definitely towards some nice high latitude blocking, and I would be surprised to see the U.S. get the short end of the stick two winters in a row...especially with a change in ENSO. Link to comment Share on other sites More sharing options...
SVT450R Posted September 26, 2012 Share Posted September 26, 2012 Link to comment Share on other sites More sharing options...
weathafella Posted September 27, 2012 Author Share Posted September 27, 2012 Let's compare 9/17, the day this thread started to today. 9/17: 9/20: Not much difference in ice yet and of course snow waxes and wanes this time of year still. This post will auto update the current picture so we'll see from day 1 to the present as we roll forward in one post. Here's the progress over the last 9 days. Link to comment Share on other sites More sharing options...
The_Global_Warmer Posted September 27, 2012 Share Posted September 27, 2012 The waxing and waning is about to stop and real growth is about to take place. Daily Departure - September 26, 2012 (Day 270) Daily Climatology - October 1 (Day 274) Link to comment Share on other sites More sharing options...
Analog96 Posted September 27, 2012 Share Posted September 27, 2012 1952-53 started out with snow in October, November, early December and New years Eve...A little bit more the first half of January and that was it...There was a big change in the pattern after that...The AO index from Dec-Mar was -1.827, -1.036, -0.249, +1.068...The PDO from Dec-Feb was 0.04, -0.57, -0.07...It was a weak enso but it was a second year weak nino... Would you say that 1989-90 is a fair analog for 1952-53? Or was 1989 colder? Link to comment Share on other sites More sharing options...
asthut Posted September 27, 2012 Share Posted September 27, 2012 I like the 2006-07 analog. Check out the SST Anomalies right now and compare them to October of 2006. They are very similar. In that year we also transitioned out of a la nina and phased into an el nino. PDO was a touch on the positive side that year. I am not concerned though because the SST anomalies look so similar. Also in the mid 2000's we started the transition toward a - decadal period of PDO. NAO/AO could be the deal breaker though as it was positive in 06-07. Cool SST in the mid-Atlantic have shown correlation with a negative NAO. Take a look at the anomalies in the mid-Atlantic during the last few weeks... We are trending cooler. Link to comment Share on other sites More sharing options...
Mallow Posted September 27, 2012 Share Posted September 27, 2012 Glad that we're below normal so far. I want it to stay below normal through about Oct 10th, then take off! Link to comment Share on other sites More sharing options...
clskinsfan Posted September 28, 2012 Share Posted September 28, 2012 For those who are interested, Dr. Cohen's paper can be found at: http://www.nws.noaa....ohen_062211.pdf I strongly agree. Have a happy New Year, Jerry. Great read! Thanks for posting the link. I wonder if only a decade of data is enough time for it to mean anything though. Link to comment Share on other sites More sharing options...
HM Posted September 28, 2012 Share Posted September 28, 2012 Glad that we're below normal so far. I want it to stay below normal through about Oct 10th, then take off! I'm not. Climatologically, snow barely reaches 60° at the start of October. I would, at the very least, want the snow cover north of there to start off normal so that it is more likely to expand/build southward throughout the month in a self-sufficient way. Remember, the latitudes that correlate (change in snow and AO) are from 60N southward which is basically southern Siberian on down (I believe to 25N). The longitude covers everywhere from the PM to DL. Link to comment Share on other sites More sharing options...
Mallow Posted September 28, 2012 Share Posted September 28, 2012 I'm not. Climatologically, snow barely reaches 60° at the start of October. I would, at the very least, want the snow cover north of there to start off normal so that it is more likely to expand/build southward throughout the month in a self-sufficient way. Remember, the latitudes that correlate (change in snow and AO) are from 60N southward which is basically southern Siberian on down (I believe to 25N). The longitude covers everywhere from the PM to DL. That's true. Thanks for the correction. So, I want snow down to 60N, but no further south, until the second week of October then. Link to comment Share on other sites More sharing options...
HM Posted September 28, 2012 Share Posted September 28, 2012 That's true. Thanks for the correction. So, I want snow down to 60N, but no further south, until the second week of October then. lol yeah something like that. The one thing 2009 had that a lot of other years did not was the rapid/above normal expansion toward Europe and on the southern edge late October. There is something to be said about other climate factors, like ENSO, possibly aiding in favorable circulation for something like this to happen. Simply running ENSO correlations in the autumn show how an El Niño could help build the western and southern extent in October but it obviously isn't the whole story. Besides snow cover, I want to see a stronger Brewer Dobson Circulation than last year, that's for sure. While it is still very early to say for sure, I see no signs yet of last year's regime changing in this department. But that statement is almost meaningless at this point in time. Funny, as I said this, I noticed an elevated proton flux from the sun...sigh... Link to comment Share on other sites More sharing options...
SVT450R Posted September 29, 2012 Share Posted September 29, 2012 Link to comment Share on other sites More sharing options...
SVT450R Posted October 2, 2012 Share Posted October 2, 2012 Link to comment Share on other sites More sharing options...
weathafella Posted October 3, 2012 Author Share Posted October 3, 2012 Nice gains in Siberia today. Link to comment Share on other sites More sharing options...
WidreMann Posted October 3, 2012 Share Posted October 3, 2012 Nice gains in Siberia today. Rose-colored glasses. Link to comment Share on other sites More sharing options...
The_Global_Warmer Posted October 3, 2012 Share Posted October 3, 2012 Rose-colored glasses. It's starting off slow, but it has happened a lot and can change very quickly. Oct 2nd departure Oct 2nd Climo: Link to comment Share on other sites More sharing options...
weathafella Posted October 3, 2012 Author Share Posted October 3, 2012 Rose-colored glasses. Compare 10/1 to 10/2. Link to comment Share on other sites More sharing options...
weathafella Posted October 4, 2012 Author Share Posted October 4, 2012 Compare 10/1 to 10/2. More gains today..Siberia. It's only 10/3 but by mid month it's worth evaluating vs climo. Link to comment Share on other sites More sharing options...
SVT450R Posted October 5, 2012 Share Posted October 5, 2012 Link to comment Share on other sites More sharing options...
weathafella Posted October 5, 2012 Author Share Posted October 5, 2012 Running departures from climo on the Rutgers site, 10/1 was solidly below, 10/4 is much closer to climo. Talking Siberia only. Link to comment Share on other sites More sharing options...
tacoman25 Posted October 5, 2012 Share Posted October 5, 2012 Running departures from climo on the Rutgers site, 10/1 was solidly below, 10/4 is much closer to climo. Talking Siberia only. -EPO is hurting anomalies in Alaska/NW Canada right now, but it looks like northern Asia/Siberia is gaining nicely. Link to comment Share on other sites More sharing options...
GaWx Posted October 5, 2012 Share Posted October 5, 2012 I wasn't sure of the best thread for this, but I'll put it here. Per the NOAA PDO table, the PDO fell even further from -2.32 in Aug. to -2.82 in Sep.: ftp://ftp.ncdc.noaa.gov/pub/data/cmb/ersst/v3b/pdo/pdo.dat This is surprising to me as I had expected the PDO to rise from the low Aug. level. The other PDO table, which I had been following recently, has yet to update for Sep.: http://jisao.washing.../pdo/PDO.latest The JISAO negatives have tended to be lower in magnitude than NOAA's. Regardless, the NOAA -2.82 suggests the chance for a sub -2 in JISAO in Sep. I had been expecting a rise in JISAO from the -1.93 of Aug. to something above -1.50 in Sep. due to SST anom. changes since mid-Sep. Link to comment Share on other sites More sharing options...
tacoman25 Posted October 5, 2012 Share Posted October 5, 2012 I wasn't sure of the best thread for this, but I'll put it here. Per the NOAA PDO table, the PDO fell even further from -2.32 in Aug. to -2.82 in Sep.: ftp://ftp.ncdc.noaa.gov/pub/data/cmb/ersst/v3b/pdo/pdo.dat This is surprising to me as I had expected the PDO to rise from the low Aug. level. The other PDO table, which I had been following recently, has yet to update for Sep.: http://jisao.washing.../pdo/PDO.latest The JISAO negatives have tended to be lower in magnitude than NOAA's. Regardless, the NOAA -2.82 suggests the chance for a sub -2 in JISAO in Sep. I had been expecting a rise in JISAO from the -1.93 of Aug. to something above -1.50 in Sep. due to SST anom. changes since mid-Sep. The eastern regions of the PDO area were still quite warm in September, which is probably the main reason for the big negative number. However, I trust the JISAO numbers more in comparison to historical figures for a variety of reasons. I think NOAA tends to have the more recent PDO numbers too low, from at least the 1990s on. I could be wrong, but I don't think we will have a big drop in the Sep number for JISAO. There have only been three years that have been -2 or lower: 1933, 1950, and 1961. Link to comment Share on other sites More sharing options...
The_Global_Warmer Posted October 6, 2012 Share Posted October 6, 2012 Looks like the North American side will get better. The Russian side is progged to get awfully warm. Link to comment Share on other sites More sharing options...
weathafella Posted October 7, 2012 Author Share Posted October 7, 2012 Big ramp up the first 6 days of October in Siberian snow. From solidly below to near normal. The next 10-15 days may well be the most critical. Link to comment Share on other sites More sharing options...
icebreaker5221 Posted October 7, 2012 Share Posted October 7, 2012 Big ramp up the first 6 days of October in Siberian snow. From solidly below to near normal. The next 10-15 days may well be the most critical. Looks like a couple of quick-hitting "clipper-like" systems will sweep across Siberia the next couple days and build upon the snowpack in the short term. Probably some melt after that in the 6-10 day, looking awfully ridgy (below). Beyond that they should get back into a better pattern for building up the snowpack, but whether the rate of snowcover growth is above or below climo is tough to say at this point. Link to comment Share on other sites More sharing options...
Mallow Posted October 7, 2012 Share Posted October 7, 2012 Big ramp up the first 6 days of October in Siberian snow. From solidly below to near normal. The next 10-15 days may well be the most critical. 2009 didn't really pick up until the last ten days of the month, so I'd say we still have time. Link to comment Share on other sites More sharing options...
Typhoon Tip Posted October 8, 2012 Share Posted October 8, 2012 Actually we kinda want snowcover to start off below normal in Siberia for October. Cohen's latest paper, as I mentioned earlier, shows a much stronger correlation with the change in snowcover during the month of October than the average snowcover for the month. http://web.mit.edu/j...Jones_GRL11.pdf I've been waiting for a reputable source to acknowledge this suggestion for year! I have seen it in the numbers my self that rate of change tells more about the system then static measures - it's intuitively correct that way, too. I have posted of this in the past; not sure if here or in the antiquated Eastern site - Link to comment Share on other sites More sharing options...
SVT450R Posted October 8, 2012 Share Posted October 8, 2012 Link to comment Share on other sites More sharing options...
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