“An unusually intense, early season heat wave is gripping areas from Texas to the entire Southwest, including major metro area such as Houston, Phoenix, Las Vegas and Sacramento,” is how one media source explained the “dangerous” heat wave, with temperatures between 100-106°F (Sacramento) and 122°F (Death Valley) that swept over Texas, Arizona and California earlier this month, causing the National Weather Service to issue a high warning for heat-related illnesses.
We should all, by now, be questioning every media report on extreme weather events that use words like “unusual” or “rare” to describe weather that is, thanks to climate change impacts, becoming decidedly less rare and tipping into the “seasonal” category.
Just look at what’s happening here in western Washington and Oregon this month: flooding followed by a heat wave. The daily newspaper in Oregon’s capital city described the cause of the recent heavy rains as a “rare atmospheric river,” but how “rare” are these atmospheric rivers? If you’re living in a pre-climate change mindset, these events might seem like they are still an anomaly. Unfortunately, atmospheric rivers, which drench an area with heavy rainfall, often causing flooding events usually only seen once every decade or even once every century, are becoming more frequent thanks to climate change.
“These are natural events, which happen all the time around the world. But in British Columbia, they seem to be happening more frequently. The region has seen an uptick in the frequency of landfalling atmospheric rivers since the 1940s, according to one recent study,” a November 2021 article in Scientific American magazine noted. “Research suggests that atmospheric rivers all over the world likely will grow bigger and more intense as the climate warms. That could mean more severe rainfall when they hit land.”
According to the nonprofit, nonpartisan organization Climate Signals, not only do these atmospheric rivers “cause most of the flood damage in the Western United States,” but “rising temperatures mean more precipitation falls as rain instead of snow, increasing runoff risks associated with atmospheric river storms.”