By Seth Borenstein
A new scientific report finds man-made climate change played some role in two dozen extreme weather events last year but not in a few other weird weather instances around the world.
An annual report released Thursday by the National Oceanic and Atmospheric Administration found climate change was a factor, however small or large, in 24 of 30 strange weather events. They include 11 cases of high heat, as well as unusual winter sunshine in the United Kingdom, Alaskan wildfires and odd “sunny day” flooding in Miami.
The study documented climate change-goosed weather in Alaska, Washington state, the southeastern United States, Canada, Europe, Australia, China, Japan, Indonesia, Sri Lanka, the western north Pacific cyclone region, India, Pakistan, Egypt, Ethiopia and southern Africa.
“It has to be measureable. It has to be detectable. There has to be evidence for it and that’s what these papers do,” said NOAA scientist Stephanie Herring, co-editor of the report.
In six cases — including cold snaps in the United States and downpours in Nigeria and India — the scientists could not detect climate change’s effects. Other scientists, though, disputed that finding for the cold snap that hit the Northeast.
Herring highlighted the Miami flooding in September 2015. Because of rising sea levels and sinking land, extremely high tides flooded the streets with 22 inches of water.
“This one is just very remarkable because truly, not a cloud in the sky, and these types of tidal nuisance flooding events are clearly become more frequent,” she said.
The report also found an increase in tropical cyclone activity and strength in the western Pacific can be blamed partly on climate change and partly on El Nino, the now-gone natural weather phenomenon. But similar storm strengthening hasn’t increased noticeably around the United States yet, said study co-editor Martin Hoerling, a NOAA scientist.