CNN CNN Newsroom Live December 21, 2021 09:26:00
Landfall basically across the west coast. when it does so, it creates a lot lot of rainfall and sparks snowfall in elevations out west. which is what we're going to see. we've seen multiple atmospheric rivers over the last month or so. a recent atmospheric river led to the sierra nevada seeing its snow pack increase from 19% to 98% in a matter of just seven days. that's how quickly things can escalate with these atmospheric rivers. you can see as this area of low pressure does come ashore, we'll see snowfall pile up not only across the sierra nevada, but all the way up to the pacific northwest...
Source: archive.org