Atmospheric rivers have become a frequent topic of discussion, particularly as these weather events increase in both frequency and intensity due to climate change. Historically referred to by various names, such as the “tropical plume” and “Pineapple Express,” atmospheric rivers have been linked to significant flooding events, including a catastrophic flood in California in 1862 that led to the state’s capital temporarily relocating to San Francisco. These weather phenomena are now understood to be occurring more frequently and with greater intensity, with a recent study indicating a 2%-6% increase in storm intensity and a 9% increase in the average area they soak over the past 45 years.
Lexie Henney, an atmospheric scientist involved in the study, emphasized that while the research does not directly attribute these changes to climate change, the data suggests that atmospheric river patterns align with expectations linked to a warming climate. The term “atmospheric river” gained popularity only in the 1990s, and some media outlets have even begun rating these storms on a scale similar to hurricanes. The extreme precipitation from atmospheric rivers is crucial for understanding changes in overall precipitation patterns.
One significant manifestation of these storms was the resurgence of Lake Tulare in early 2023, a once-depleted inland lake that reformed after a series of atmospheric river storms, leading to widespread flooding. This phenomenon underscores the connection between atmospheric rivers and the changing landscape in California and the larger effects of climate change on weather patterns.
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