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Observed at 14:00, Friday 8 November BBC Weather in association with MeteoGroup, external All times are Central Standard Time (America/Chicago, GMT-6) unless otherwise stated.

Why are the Northern Lights so supercharged lately and how long will this last?

Higher pressure is usually associated with sunny weather, lower pressure with stormy weather. The temperature to which the air needs to be cooled for moisture to condense, for example, as dew.