Monday February 26th… Dear Diary. The main purpose of this ongoing post will be to track United States extreme or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme temperatures as ETs (not extraterrestrials)😊. Here is today’s main climate change related topic: More Polar Vortex Diagnoses
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Yesterday I posted a rather long summary entitled “The Sick Vortex” showing how many climate scientists have noted extreme warmth in the Arctic in late February going into early March. Technically I didn’t meteorologically diagnosis exactly why we are seeing a lot of “weird” weather patterns across the Northern Hemisphere beyond blaming any “sickness” on climate change via carbon pollution. Daniel Swain does:
Cutting to the chase here is Daniel’s polar vortex prognosis in his own words:
The stratospheric polar vortex splits, leading to wild Northern Hemisphere weather
“Why did California suddenly flip from persistent record warmth and dryness to near-record cold (and well, slightly less persistent dryness)? The atmospheric flow pattern over the entire Northern Hemisphere is extremely amplified at the moment, with a pair of very strong blocking high pressure systems centered over the far North Pacific (south of the Aleutian Islands) and the far North Atlantic (near Greenland). These two features are acting like boulders in a stream, deflecting the normally west-to-east storm track (jet stream) over the mid-latitudes into a very wavy, north-to-south configuration. Alternating, essentially stationary zones of extreme winter warmth and cold have resulted from this wavy pattern all across the Northern Hemisphere.
Yes, I will be watching for the other shoe to drop in association with what usually happens with a negative NAO, a cold weather pattern for the East. I’ve notice that the flora around my home town of Atlanta is starting to bloom at east three weeks early in this “false spring” after a few days of record warmth near 80F. As noted by Climate Central:
I may add more relevant information to this post later this evening.
The Climate Guy