An atmospheric river event is forecast to rainfall, snow, and the potential for flooding to parts of California this week.

The storm brought heavy rain and high-elevation snowfall to Northern California over the weekend, and a similar one is ...

Weather balloons and “hurricane hunter” planes aid the science of understanding California’s atmospheric rivers.

What is a Pineapple Express? It's a type of atmospheric river that forms a long, narrow tract in the Earth’s atmosphere. This jet stream gathers moisture from the tropics near the equator and ...