_x000D_Screenshot: CIRA on X (twitter.com)

What is an “atmospheric river”?

An atmospheric river is a phenomenon where moisture gathers in the atmosphere and moves with the wind. This forms long, narrow bands that transport significant amounts of moisture. These rivers in the sky are crucial in determining global precipitation distribution. “Pineapple Express” refers to a specific type of atmospheric river that brings warm subtropical moisture from near Hawaii to places like California. This moisture can lead to heavy rainfall and snow, causing beneficial water supplies and potentially severe flooding. For instance, California braced for “life-threatening” flash flooding due to an atmospheric river event expected to bring the season’s largest storm, as reported in early February 2024.