Report highlights significant lightning drought for much of the US during the past year
Jan 05 2021 Read 671 Times
Thanks to industry-leading detection accuracy and unparalleled data history dating back more than 30 years, Vaisala has identified the most significant year-over-year decrease in lightning activity across the US since 1989.
Vaisala has released its 2020 Annual Lightning Report in advance of the 101st American Meteorological Society (AMS) Annual Meeting, held virtually next week for the first time due to the ongoing COVID-19 pandemic. The Vaisala data reports that 2020 saw a total of 170,549,822 cloud-to-cloud and cloud-to-ground lightning events in the continental U.S., compared to 222,988,888 in 2019, a decrease of 52.4 million events.
Vaisala’s National Lightning Detection Network (NLDN) has provided lightning detection coverage of the continental U.S. longer than any other system. It delivers proven performance in detecting total lightning (both cloud-to-ground and in-cloud lightning), providing valuable data with unmatched accuracy for many public and private applications on both local and national levels.
“Vaisala pioneered continental-level lightning detection and leveraged 31 years of comprehensive historic lightning data to determine the incredible lightning drought last year, which was caused by an anomalously strong area of high pressure over traditionally lightning-prone regions,” said Ryan Said, Lightning Scientist at Vaisala. “This history and the accuracy of our data allows us to reliably track trends and changes over time, ensuring we can provide both current reporting as well as trustworthy long-term analysis and interpretation.”
Among the major findings of the report was a lightning drought. Thirty-nine of the Lower 48 states were below average for lightning in 2020, but Michigan saw one of its most active lightning years on record, with 2,317,693 detected lightning events. Despite fewer lightning counts across many regions, including the southwestern U.S., there were a number of significant wildfires triggered by lightning. Many such areas have experienced longstanding drought, making the vegetation much more susceptible to catching fire if struck by lightning. Texas again led the nation in total lightning with more than 33 million strokes, followed by Florida (up three places from 2019) with just more than 12 million. Oklahoma, Kansas, and Missouri round out the top five states in the report. Six of the seven states with the least amount of lightning on average also experienced among their five driest years on record, as many areas rely on thunderstorms to provide necessary rainfall. Also of significant interest was that Vaisala’s Global Lightning Dataset (GLD360) detected more lightning (192 events) north of 85 degrees north than in any previous year, including 2019, when GLD360 detected the farthest north lightning on record, just 52 kilometres from the North Pole.
Accurate lightning information and education is critical to the protection of life and property. According to the National Interagency Fire Center (NIFC), each year lightning in the U.S. causes roughly 9,800 fires that burn more than 3.7 million acres, impacting the lives of thousands of residents. The Annual Lightning Report plays an important role in supporting lightning education and maintaining awareness for meteorologists, firefighters, and community leaders.
“Although California saw fewer than 300,000 lightning events in 2020 — a 48% decrease from their previous five-year average — more than 20% of the events occurred during a four-day period in August, in what was described as a lightning siege,” explained Chris Vagasky, Meteorologist and Lightning Applications Manager at Vaisala. “This onslaught of lightning, which was accompanied by very little rainfall, triggered four wildfire complexes that combined to burn more than 1.8 million acres of land.”
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