Another Year of La Niña May Extend the Western Drought
After a record-breaking drought, much of the West and Southwest has been hoping for a winter of rain. But with scientists predicting a second consecutive winter with La Niña conditions, the dry spell may be prolonged. La Niña is a climate pattern that tends to produce droughts in the West and hurricanes in the East. This week the NOAA issued an advisory noting an 87% likelihood that La Niña will affect winter weather across the US.
Why this Matters
Another year of La Niña could exacerbate the western drought, which has engulfed 93% of the West, with close to 60% of the region in extreme or exceptional drought. These conditions have an even more disastrous effect coupled with climate change, which has left western regions mired in drought conditions and fire vulnerability.
Park Williams, a climate scientist and professor at UCLA told the Guardian: "As long as greenhouse gases continue to accumulate in the atmosphere, the dice are loaded toward increasingly warmer temperatures, meaning less mountain snowpack, greater spring evaporation, and more intense summer heatwaves and wildfire activity."
TomoNews US: La Nina Emerging, Set to Worsen Extreme Drought in the U.S., October 13, 2021.
Another Year of La Niña
La Niña occurs when surface temperatures in the Pacific Ocean near the equator are particularly cold. Winds push warm water west, and this water evaporates and becomes rain clouds, affecting weather globally.
In the Pacific Northwest, La Niña will bring a particularly wet winter and spring. Although it would seem heavy rain were a godsend during drought -- the dry, fire-scorched topsoil has difficulty absorbing rainwater, causing the potential for mudslides. Meanwhile, the drought in the Southwest may continue into next year.
This past summer, drought conditions led to the first-ever water shortage for the Colorado River. Experts say the weather pattern could continue impacting water supplies in the West. Additionally, La Niña could lead to another severe wildfire season in 2022.
CBS: What the megadrought means to the American West, July 18, 2021.