Like much of the West, California endured extreme drought conditions and another grueling fire season in 2021. The rainy season, however, got off to a promising start, with above-normal precipitation in October and December. But hopes of an end to the drought gripping most of the Western U.S., which scientists have linked to climate change, quickly evaporated as record dry conditions took hold in California in January and February.
A wind-driven fire burns in the hills above Emerald Bay and Irvine Cove in Laguna Beach, Calif., on Feb. 10. defines VPD as “the difference between the water vapor pressure at saturation and the actual water vapor pressure for a given temperature, [and] is an important driver of atmospheric water demand for plants.”Vapor pressure deficits help explain why the risk of fire danger continues to grow in some parts of the world even though it’s also true that for every 1°C of warming, the Earth’s atmosphere holds 7 percent more moisture.
“The leading cause of the rapid increase of wildfires over the Western U.S. is the rapid increase of surface air vapor pressure deficit, or VPD, a measure of how thirsty the atmosphere is.” NOAA stated on its website. “When VPD is higher, the air is hot and dry and draws more moisture from soil and plants, which not only increases biofuel flammability, but also reduces river flows and reservoir levels.
What this means in places like California is that rain is not the only factor when it comes to wildfire danger.
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