Atmospheric River Dumps Historic Rainfall on the Pacific Northwest

March 1, 2022·2 minutes

The first day of meteorological spring began with a significant deluge in the Pacific Northwest. Parts of Washington and Oregon have reached nearly six inches of rain over the last two days, causing flood and landslide concerns. 

This recent atmospheric river dumped historic amounts of rain. The National Weather Service reported 14.41 inches of rain at Olympic National Park on Tuesday morning. The Seattle-Tacoma International Airport recorded 2.97 inches, beating a rainfall record set in 1972. 

The National Weather Service warns that “excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations” through Tuesday afternoon.

The Pacific moisture plume that dumped heavy rain and snow over the Pacific Northwest is expected to weaken as it moves inland. This will provide some reprieve from recently heavy threats of precipitation. However, the NWS reports that unsettled weather will continue through the midweek as the associated low-pressure system directs moisture toward the coast. This could bring showers to the Northern and Central California coast, but overall, rain accumulations will be light.


Grace Gagnon is the Product Marketing Manager of's B2C app. She previously worked at ProfitWell, a pricing optimization platform. Prior to entering the startup world, Grace worked as a television news reporter at WBNG-TV, where she covered severe weather and breaking news. Outside of Tomorrow, Grace enjoys reading, walking her dog, and crafting.

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