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Atmospheric rivers to soak Oregon with days of heavy rain

A rainy roadway lined with trees
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Two atmospheric rives are expected to hit northwest Oregon beginning Monday, Dec. 8, 2025.

The National Weather Service says a large swath of Oregon will see heavy rain this week as two strong atmospheric rivers move through the region.

A surge is expected on Monday, and another on Tuesday night to Wednesday.

Tyler Kranz is a meteorologist with the National Weather Service in Portland. He said while the heaviest rain is expected in the Portland area, areas south will still see significant rainfall over a 72-hour period.

"Lane County, including Eugene, is at the southern periphery of where the rain is heaviest, so we’re still forecasting upwards of almost 4 inches right in Eugene actually,” Kranz told KLCC.

The Coast Range and Cascades could see 6 to 12 inches of rain from these systems.

There is a Flood Watch for several counties, including Lane, Lincoln, Benton, and Linn from 4:00 a.m. Monday through 4:00 a.m. Friday. South of Lane county, rain totals drop off, but forecasters say quick rises on rivers are still possible, and things could change.

“There is still a chance that it shifts just far enough south to where those counties would be fair game,” said Kranz. “But right now, that area is not favored to get hardest hit.”

Urban flooding and driving hazards like hydroplaning are possible as well. “There’s about a 35% chance of rain rates high enough to overwhelm storm drains in Eugene, and hydroplaning will be a risk late Monday through Wednesday," said Kranz.

The National Weather Service also warns of landslides in steep terrain and debris flows near burned areas.

Love Cross joined KLCC in 2017. She began her public radio career as a graduate student, serving as Morning Edition Host for Boise State Public Radio in the late 1990s. She earned her undergraduate degree in Rhetoric and Communication from University of California at Davis, and her Master’s Degree from Boise State University. In addition to her work in public radio, Love teaches college-level courses in Communication and Sociology.