These are sea temperature anomalies on the East Siberian Arctic Shelf (ESAS) as of last night. This is right where there are methane clathrates in shallow sea.
Here is the latest measurement of methane at ground level on Thurs, 5 July from CAMS
Meanwhile there is another massive cyclone in the Arctic as of yesterday (~968 hPa)
Here it is reflected in Nullschool
Global temperature anomalies
Global sea temperature anomalies