A "bomb cyclone" and an "atmospheric river" are poised to deliver intense ... and "cyclogenesis," which describes the formation of cyclones—low-pressure systems that rotate counterclockwise ...

"The formation of this rapidly strengthening ... the weather service said. An atmospheric river prompted a high-risk warning for excessive rainfall along the Northern California coast.

Forecasters warn of dangerous conditions as another powerful atmospheric river takes aim at California. While these storms are dreaded for the damage they can cause, they are also essential to the ...

A National Weather Service map shows the impacts from an atmospheric river extending into the interior U.S. The storm hit the West Coast on Christmas. A National Weather Service map shows the ...

Multiple atmospheric rivers taking aim at the Pacific Northwest could unleash a deluge across several states through Christmas Eve, AccuWeather reported. Millions of Americans will travel for the ...

A series of three atmospheric river storms has already started bringing rounds of rain and mountain snow across the West Coast, most notably in northern California, through Monday. The first ...

PORTLAND, Maine (AP) — The U.S. East Coast was beginning a whiplash-inducing stretch of weather on Wednesday that was rainy, windy and potentially dangerous, due in part to an atmospheric river ...