The annual number of lightning strokes in the Arctic — the region north of around 65 degrees latitude — has remained consistent over the past decade, but it is now surging significantly in the extreme north. Chris Vagasky, meteorologist and lightning applications manager at Vaisala, said a warming planet is charging up the Arctic’s environment for more lightning to occur.
“What we’ve been seeing is that lightning and thunderstorms are developing over Siberia, and then moving out over the Arctic Ocean and continuing very far north,” Vagasky told CNN, underscoring “the warm, humid air from all continents are now going out over the Arctic Ocean and they’re persisting over the Arctic Ocean, so that you get storms that are developing there.”
Jose Martinez-Claros, a researcher at the University of California, San Diego’s Center for Western Weather and Water Extremes, who is not involved with the report, said the findings were “concerning.”
“It seems to suggest in the drying and warming climate, these types of storms now reach latitudes that are very much higher than they used to be and closer to the Arctic,” he said.
“We know that the Arctic is changing faster than the rest of the Earth with respect to its climate,” Vagasky said. “And so monitoring these trends in thunderstorms and lightning in this very remote area helps us detect where these warm, moist air intrusions are occurring in this region.”
Lightning in the US also increased in 2021, according to the Vaisala report, where more than 194 million lightning strokes occurred — 24 million more than what was observed in 2020.
More than 1 million of those occurred in December, in concert with several unprecedented winter time severe weather outbreaks that ravaged the Central and Southern US. It was the highest number of strokes researchers have seen in December since 2015, Vagasky said, noting now “even the December time period, you might be getting spring- or summer-type conditions,” he added.
In the US, Texas recorded the most lightning last year, primarily due to its large area and warm, storm-prone location, Vaisala reports. Florida saw the highest lightning density than any other state, with 223 lightning events per square mile, followed by Louisiana and Texas.
Vaisala has been detecting lightning in the US for nearly 40 years, and around the planet since 2012. The network detects more than two billion lightning events around the world each year, according to Vaisala, including a 2019 lightning event around 32 miles from the North Pole, which set a Guinness World Record for the northernmost lightning stroke ever detected.
“All weather is local,” Vagasky said. “When you’re having these drastic changes, especially in places like the Arctic, those sorts of changes are not just impacting the Arctic. The Earth is totally interconnected.”