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Link the source please. There is another thread claiming a 70 F above normal. The twit posted on twitter the -12.4 C on twitter for Concordia. This station has only been there since 2005, so we have no data before that showing what a long cycle high temperature can be. The record high at that station reached -12.2 C on 3/19, and the average March high is -48.7 C. This makes it 38.3 C (65.3 F) higher than any March high previously recorded. The record low is -72 C. This is according to Wikipedia.
Now there is a site that you can see the temperatures.
Resumen synop
ogimet.com
Notice this is a short event. Notice also when the winds blow from the between the north and east, the temperture increases. I suggest that maybe it is seeing the heat from the site.
3/15/2022 -51.3
3/16/2022 -49.3
3/17/2022 -27.9
3/18/2022 -18
3/19/2022 -12.2
3/20/2022 -15.9
3/21/2022 -21.9
3/22/2022 -29.5
3/23/2022 -36
3/24/2022 -43.5
Now if you look at the landscape:
Google Maps
Find local businesses, view maps and get driving directions in Google Maps.
www.google.com
We see it is very dirty in the area. That few days of an anomaly could have been heat that traveled from buildings, construction, etc. The monitoring equipment could have been dusted with dirty particulate matter. There could have been equipment runnunbg nearby and the wind blowing just right. We simply don't know. All we know is the equipment recorded the event.
Consider this:
Both Lazzara and Meier said what happened in Antarctica is probably just a random weather event and not a sign of climate change. But if it happens again or repeatedly then it might be something to worry about and part of global warming, they said.
Hot poles: Antarctica, Arctic 70 and 50 degrees above normal
Parts of Antarctica Friday hit 70 degrees warmer than normal. At the same time parts of the Arctic were 50 degrees warmer than normal. Scientists are stunned.
apnews.com