After back-to-back years of concerning low activity in 2021 and 2020, the total number of lightning strikes was closer to average. Still, pockets of the country showed record low or high activity.
. La Niña is characterized by cooler-than-normal ocean temperatures near the equator in the eastern Pacific, which can cause changes in atmospheric circulation and weather patterns near and far. DiGangi explained that La Niña tends to favor drier winters in the central United States, which further set up for dry conditions and can affect lightning during the summer.
“This might be the most lightning that we’ve detected across the state of Florida," said Vagasky, although he notes the detection technology has gotten better since the 1980s. “Most hurricanes don’t produce a ton of lightning except when they’re rapidly intensifying,” DiGangi said. “But Hurricane Ian underwent multiple phases of rapid intensification in quick succession, so there ended up being like almost continual lightning in the core of Ian for like two days.”DiGangi said how often storms undergo eyewall replacement and rapid intensification can be boosted by climate change, which could favor more lightning in the eyewall in future storms.
Lightning activity last year was also up in Arizona by 65 percent compared to the recent average, according to Vaisala data. Chalk that up to an active monsoon in the Southwest, which probably helped mitigate the fire risk, DiGangi said. The monsoon was active for a second year in a row and helped somewhat shrink drought conditions, although most of the western United States still experienced severe drought.
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