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Hydrologic Outlook
National Weather Service Portland OR
251 PM PST Sat Dec 28 2024

...EXTENDED PERIOD OF WET WEATHER WILL LEAD TO RISES ON RIVERS AND
AN INCREASED POTENTIAL FOR FLOODING...

A series of storm systems will continue to bring a wet weather
pattern across northwest Oregon through the weekend. This will lead
to rises on rivers and creeks through at least December 30th. As of
this writing, the Luckiamute River has risen just above minor flood
stage and has crested. It will continue to fall below flood stage
this evening. Through this next system arriving on Sunday, rivers
will continue to rise with a few rivers building confidence in their
flood potential.

There is around a 20% chance of the Luckiamute River to rise again
into minor flood stage within the next 3 days, and a 35% chance of
the Pudding River at Aurora reaching Minor Flood Stage. Our eyes
remain on other rivers in the area. In the case this incoming system
over performs, then other area rivers will rise.

Heavy rainfall may also lead to ponding of water, general lowland
flooding and localized urban flooding, especially in low lying areas
or other areas with poor drainage. Heavy rainfall will also increase
the potential for landslides in areas of steep terrain and debris
flows over areas that have been burned by wildfires over the past
few years.

Shifts in the forecast storm track can change the current outlook
and probabilities for river flooding, so be sure to monitor
weather.gov/portland for the latest weather updates, as well as any
watches, warnings, or advisories that may be issued. To view the
latest river forecasts, visit water.noaa.gov/wfo/pqr.

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