The statistics for the storm that produced the Colorado floods are stunning. But there was a very similar storm in 1938, suggesting nature can surprise even without human help.
The record-breaking storm that caused the Colorado floods has been called a “thousand-year event,” leading to speculation about whether the storm and flooding owed anything to climate change.
The answer, of course, is impossible to know for sure. But according to a panel of climate scientists from Colorado, the storm likely had little to do with climate change and more to do with an unusual confluence of atmospheric events.
It’s possible that some shifts due to climate change, such as increased water vapor in the air, may have exacerbated the effects of the storm slightly. But a storm in September 1938 was very similar in its footprint, its timing, and the type of rainfall (which was not the brief, intense thunderstorms typical here).
“Having seen the September 1938 analog should somewhat humble us, and remind us that nature has a way of delivering without human intervention in the climate system,” says Martin Hoerling, a research meteorologist at NOAA’s Earth System Research Laboratory in Boulder, Colo. “Climate change is operating, there’s no question about that, and water vapor has gone up,” but in this instance, climate change “really wasn’t a factor.”