NWS Boulder (@NWSBoulder) November 27, 2012
Repeat warning. Atmospheric river heading for West Coast. Here's a gif image: esrl.noaa.gov/psd/atmrivers/…. Expect very heavy rains; flooding risk—
Peter Gleick (@PeterGleick) November 27, 2012
Here’s the link to the NOAA model animation.
Here’s the lowdown on atmospheric rivers via the NOAA and YouTube (2 minutes or so).