Lightning Longer, Stronger and More Extreme
The World Meteorological Organization has recently confirmed that a bolt over Oklahoma in 2007 covered a horizontal distance of nearly 200 miles (321 km), and a streak over southern France in 2012 lasted for nearly 8 seconds.
ASU professor Randy Cerveny credits “huge strides in the detection and monitoring of lightning events.”
Credit; Axel Rouvin/Flickr
Cerveny said this is the first time lightning has been included in the official WMO extreme weather and climate archive, which is maintained by the organization’s Commission for Climatology and documents details of records for heat, cold, wind speed, rainfall and other related events.
Full details of the lightning assessments are given in the online issue of the Bulletin of the American Meteorological Society, published Sept. 15.
The WMO evaluation committee judged that the world’s longest detected distance for a single lightning bolt occurred over a horizontal distance of 199.5 miles. The event occurred on June 20, 2007, stretching from near Tulsa to near the Texas border.
The committee also accepted the world’s longest detected duration for a single shock as a lightning event that lasted continuously for 7.74 seconds on Aug. 30, 2012, over Provence-Alpes-Côte d’Azur, France.
Cerveny said researchers gathered their data from networks of sensors that monitor electromagnetic radiation triggered by lightning discharges.
“The bursts are similar to the static you hear on an AM radio,” he said. “We can detect the static and its intensity. And through triangulation, we to find where the strike began and where it ended.”
Cerveny said that with new technologies, weather researchers are entering a new phase in lightning detection and understanding.
“This is the first study to address issues of lightning,” Cerveny said. “Over the next couple of decades I think we will see this field really take off.”
He also said the findings highlight the importance of safety.
“These extremes point out the need for everybody to be very aware when lightning occurs,” he said.
“Lightning can strike far from where a storm is, so this research re-emphasizes the old safety advice that ‘when thunder roars, go indoors.’”
Source: http://www.ineffableisland.com/2016/10/lightning-longer-stronger-and-more.html
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“ASU professor Randy Cerveny credits ‘huge strides in the detection and monitoring of lightning events.’”
Not longer, stronger, lightning. (I’m dying to know what “more extreme” means, in lightning.)