See this post.
I am posting this for the archives. This paragraph was particularly interesting:
There are reasons to believe that the prospects for “high-latitude blocking” events this winter are pretty good as discussed extensively in the “2017-2018 Winter Outlook” with regard to three important factors: low solar activity, an increase in the autumnal snowpack across Siberia, and the Arctic Oscillation (AO) index.
“High-latitude blocking” in the wintertime involves higher-than-normal pressure in places like Greenland, Iceland and northeastern Canada and it is important to monitor around here as it often results in sustained cold air outbreaks for the central and eastern US.
The latest runs of the GFS and European computer forecast models feature abnormally high pressure in these particular areas later this month and the predicted tanking of the AO index supports this idea for "high-latitude blocking" (i.e., negative AO).So much could be written but I would be preaching to the choir.
Speaking of choirs, not quite, but, for a real classic, skip ahead to 2:00 minutes at this video:
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