As would be expected from the recent upper air temperature forecasts for the mid August period and the 16/8/21 obs, rain fell at the Greenland Summit station with air temperatures just above freezing for several hours a couple of days earlier on 14/8. This was the day of maximum melt area during the warm air event.
https://nsidc.org/greenland-today/2021/08/rain-at-the-summit-of-greenland/
Let's just hope this doesn't become a more regular event. I would have thought that similar pressure distributions must have occurred many times before without such high temperatures but as warming continues, then maybe it will.
The melt area is now decreasing by the day but still well above the interdecile range for this time of year. Even 2012 and 2019 had much lower melts by now.