PORTLAND, Ore. — The season’s first major fall storm has placed Portland and much of western Oregon under a weather alert, with heavy rain, thunderstorms, and slick travel expected through Tuesday night, September 30.
Commuters in the Crosshairs
The National Weather Service (NWS) warns that drivers across the metro region should prepare for difficult travel conditions, including slick pavement, standing water, and possible delays along I-5 and I-84. Southbound I-5 toward Salem may see the heaviest rainfall late Tuesday into early Wednesday.
TriMet has also advised riders to anticipate possible service disruptions as road conditions deteriorate. Transit officials say waterlogged streets could slow buses and impact light rail schedules.
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Storm Details
Showers are expected to develop Monday night and strengthen throughout Tuesday. Forecasters place the chance of rain at 80% during the day Tuesday, climbing to 100% by evening as the system intensifies.
Thunderstorms are possible, with wind gusts topping 20 mph in parts of the Portland metro. By Wednesday, the storm continues with a 90% chance of rain and possible thunder. The system is expected to usher in a wetter pattern that may persist into the first weekend of October.
Impacts Across the Region
Communities across western Oregon — including Portland, Gresham, and Beaverton — could see periods of heavy downpours that strain local storm drains. City crews are reminding residents to keep gutters clear of leaves and debris to prevent backups that can flood intersections and neighborhood streets.
Officials recommend securing outdoor furniture, charging electronics in case of power outages, and allowing extra travel time during commutes.
Residents Urged to Prepare
“Even though this is our first fall storm, it’s hitting at a time when leaves are starting to fall,” forecasters cautioned. “That means drains can clog faster, which increases the risk of localized flooding.”
Residents are encouraged to avoid driving through standing water and to steer clear of flooded lanes. With lightning possible, outdoor activities should be limited during peak storm periods.
Five-Day Forecast for Portland
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Monday: Rain likely, high 68°F. Showers continue overnight.
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Tuesday: Showers with an 80% chance of rain, high 68°F. Heavy rain develops overnight.
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Wednesday: Showers, 90% chance of rain, high 67°F. Thunder possible.
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Thursday: Showers likely, high 67°F.
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Friday: Chance of showers, partly sunny, high 67°F.
Looking Ahead
While heavy rainfall and thunderstorms remain the immediate concern, meteorologists say this system is likely the start of a broader seasonal pattern. With October arriving, the Pacific Northwest typically enters its wettest months of the year.
For now, Portlanders are advised to take precautions, stay alert for changing conditions, and expect more unsettled weather as fall deepens.
