Driving the news: Aprecipitation outlook released by the National Oceanic and Atmospheric Administration shows above-normal rainfall across the Pacific Northwest in September, October and November.
What's happening: The seasonal outlooks show the footprint of La Niña's anticipated arrival this fall and winter, which is driving the forecast, NOAA meteorologist Scott Handel told Axios.
There's a 66% chance for La Niña to develop this fall and a 74% chance it develops through the winter, he said.
Threat level: November is already one of Portland's wettest months, according to historical data from the National Weather Service.
And La Niña years can bring extra heavy rains and flooding.
The bottom line: Pull those parkas out of storage.