The warm periods are linked with storms that penetrate into the Arctic from the Atlantic and Pacific oceans, and bring the temperature up by as much as 30 C in the middle of winter.
Five people, including two children, were killed in a thunderstorm in the Tatra Mountains on the Poland-Slovakia border on Thursday.
The water level on Kluane Lake began dropping last year after a river of glacial meltwater abruptly changed course, leaving docks and boat ramps high and dry.
A four-day heatwave across western Europe that killed seven people began to ease slightly on Sunday, as temperature alerts were cut back and wildfires slowly brought under control.
Entomologists believe the invasive insect is an “old hornet from a previous season that wasn’t discovered until now” because it was “very dried out."
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