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Everything posted by Phil
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So far I'm impressed with the magnitude of blocking observed this month. While its early still, I didn't expect significant blocking until November, and wouldn't have been surprised if it's waited until December/January. There really isn't much precedent for this in Niña/+QBO Octobers. Only a few cases, most recent being 2010/11. From there, you have to go way back, 1942/43 and 1959/60.
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Poleward propagation of vertical wave activity/heat fluxes into the polar upper troposphere/stratosphere. In other words, another round of PV weakening, continued high latitude blocking, jet suppression over most of the NH. Though this go around we have an initial retraction of the NPAC component, as opposed to an extension there. Probably less of an EPO contribution, more of an NAO contribution.
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Yeah I've noticed that our winters seem to cycle either on a 2yr periodicity, or a 3yr-to-1yr periodicity (three mild, one cold, or visa versa). As of late we've been in a two year cycle. Harsh winters in 2009/10 and 2010/11, mild winters in 2011/12 and 2012/13, harsh winters in 2013/14 and 2014/15, and mild winters in 2015/16 and 2016/17(?). Snowfall is a different story, though, and has more to do with storm track than temperature. Snowfall averages seem to fluctuate on decadal scales w/ longer term variations in the Hadley/Walker cell ratios and solar activity. I'm expecting some very harsh winters to close out this decade, as we come out of this multiyear Niña/cold neutral stretch during the heart of a deep solar minimum under a high NPAC/NATL Hadley Cell differential, but we'll have to get through at least one more mild winter (2016/17), and possibly a mild 2017/18 if it ends up being Niña/-QBO. If it goes neutral/-QBO, then the picture changes. As of now, I'm thinking 2018/19 and 2019/20 will be very harsh winters, with 2019/20 being your typical solar min niño response w/ blocking and consistent snowfall.
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What a blowtorch next week. Highs in the 80s? Yuck. Can already tell this is going to be another predominantly mild winter, though probably not as mild as last winter. Analogs suggest a behemoth Arctic shot is possible in January.
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Trees are running late this year. Still not much in the way of color around here. October looks to be the 5th consecutive warmer than average month across the region. Would also make the last 15/17 months warmer than average..quite the warm period we've entered. In other news, hoping for some weather next week. Looks like a cutoff low develops to our S/W on latest guidance. Would lead to another period of onshore flow and precipitation, but no signs of any persistent cool, canadian air in the pattern yet..