It’s that pesky “Atmospheric River” again. Not surprisingly that particular term is not recognized by NWS/NOAA, but persists by the non-meteorological trained broadcast weather hacks.
To be fair there is a smattering of bonafide meteorological graduates scattered about...
https://www.weather.gov/mtr/AtmosphericRiver_10_24-25_2021
https://www.noaa.gov/stories/what-are-atmospheric-rivers