Warm Weather Thunderstorms are Bizarrely Occurring in the High Arctic Near the North Pole // Jul 10, 2020
The Arctic has warmed so fast that warm weather thunderstorms now occur in the Arctic reaching a record latitude of 85 degrees North. Lightning has been detected within 500 km (300 miles) of the North Pole; some lightning is amazingly occurring directly over sea ice.
The height of the lowest part of the atmosphere (troposphere) is only 7 km high in the Arctic (17 km at equator; global average 11 km), and acts as an upper cap on heights of cumulonimbus storm clouds (anvil top is at tropopause). Clearly, the 7 km limit is not stopping these Arctic thunderstorms.
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Paul Beckwith, Climate System Scientist 