The Atmospheric River: It's Here!

"Pineapple Express" Arrives

KCBS Radio Morning News
April 05, 2018 - 8:50 am

(KCBS Radio) - (updated 8:55 a.m Friday April 6)

The "atmospheric river" storm is now hitting the Bay Area. Updated projections from the National Weather Service call for 2 to 4 inches of rain at most Bay Area locations, but 4 to 8 inches in the hills and mountains. And some computer models suggest some isolated North Bay locations could be drenched with up to 12 inches of rain before it's over.

There's concern in the mountains because of the "double whammy" effect noted by UC San Diego Scripps Institution of Oceanography research meterorologist Dr. Marty Ralph. He told KCBS Radio that this storm is unusually warm, which translates into higher moisture levels.

In fact, on Friday morning, San Jose State University Professor Alison Bridger, who chairs the SJSU Meterology Department told KCBS Radio morning anchors Stan Bunger and Susan Leigh Taylor that the snow level could be as high as 12,000 feet, which could trigger widespread snowmelt.

Dr, Ralph said his latest computer models show the storm will produce "moderate to strong" atmospheric river conditions over the Bay Area for 24 to 36 hours, meaning conditions could be nasty into the midday hours on Saturday.