USGS explains: Category 1 (weak): A Category 1 atmospheric river would be a milder and briefer weather event with primarily beneficial effects, like 24 hours of modest rainfall. Category 2 ...

Everyone knows what a river is, but do you know about the concept of an atmospheric river? The majority of water vapor ...

Yes. Atmospheric rivers are rated using the atmospheric river scale, which has five categories. AR 1: Weak (primarily beneficial) AR 2: Moderate (mostly beneficial but also somewhat hazardous ...

But it turns out a top tier atmospheric river — rated Category 5 on scale of 1 to 5 — was part of the East Coast storm that killed at least five people and cut power to more than 800,000 ...

The atmospheric river could be as strong as a Category 4, with a scale that tops out a 5. Accompanied by a medley of weather alerts, a surging jet stream pushed the powerful winter storm system ...

WHILE CATEGORY FIVE IS CONSIDERED TO BE HAZARDOUS. ATMOSPHERE RIVERS ARE COMMON IN THE WESTERN UNITED STATES AND CAN CONTRIBUTE TO HALF OF THE ANNU You may have heard the term "atmospheric river ...

These categories help notify the public when they should be preparing for hazardous conditions or when an atmospheric river will perform more like a good old rainstorm and actually help the region.

But early April’s was special, a Category 5. “This was an exceptional atmospheric river, regardless of where you are in the United States,” said Jay Cordeira, an atmospheric scientist with ...

As the aircraft approached the atmospheric river, two crew members removed shiny ... California over the next two days as a strong Category 3 AR, just as predicted. By that time, the crew was ...