WASHINGTON (REUTERS) - Scientists say that climate change is increasing the likelihood of lightning strikes across the United States, after lightning struck at a square near the White House, leaving two people dead and two others in critical condition.
The hot, humid conditions in Washington, DC, on Thursday (Aug 4) were primed for electricity. Air temperatures topped out at 34 degrees Celsius - or 3 deg C higher than the 30-year normal maximum temperature for Aug 4, according to the National Weather Service.
More heat can draw more moisture into the atmosphere, while also encouraging rapid updraft - two key factors for charged particles, which lead to lightning.
A key study released in 2014 in the journal Science warned that the number of lightning strikes could increase by 50 per cent in this century in the United States, with each 1 deg C of warming translating into a 12 per cent rise in the number of lightning strikes.
Fast-warming Alaska has seen a 17 per cent rise in lightning activity since the cooler 1980s. And in typically dry California, a siege of some 14,000 lightning strikes during August 2020 sparked some of the state's biggest wildfires on record.
Beyond the United States, there is evidence that lightning strikes are also shooting up in India and Brazil.
But even as lightning strikes increase, being hit by one is still extremely rare in the US, experts say.
Roughly 40 million lightning bolts touch down in the country every year, according to the Centre for Disease Control - with the odds of being struck less than 1 in a million.
Among those who are hit, about 90 per cent survive the ordeal, the CDC says. The country counted 444 deaths from lightning strikes from 2006 through 2021.
The two men and two women struck by lightning Thursday while visiting Washington's Lafayette Square, just north of the White House, were among the unlucky few - struck by a bolt that hit the ground during a violent, afternoon thunderstorm.
The lightning hit near a tree that stands yards away from the fence that surrounds the presidential residence and offices.
All four victims sustained critical, life-threatening injuries, and were taken to area hospitals, where two later died, authorities said.
Lafayette Square is often crowded with visitors, especially in the summer months.
Because heat and moisture are often needed to make lightning, most strikes happen in summer. In the US, the populous, subtropical state of Florida sees the most people killed by lightning.