Five people, including two children, were killed in a thunderstorm in the Tatra Mountains on the Poland-Slovakia border on Thursday.
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.
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.
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.
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