A complex low pressure area offshore will maintain mild and moist southwest flow into the region today, lasting into early Sunday. This will bring rain, heavy at times, to northwest Oregon and southwest Washington. Currently, rainfall of 1 to 3 inches is expected across the region, with 2 to 5 inches over the Willapa Hills and Coast Range. Snow levels will be rising Friday, and hover at 7000 to 8000 feet this afternoon through this weekend.
With all this rain, and snowmelt from the Coast Range and Cascades, rivers will be rising. As of early Friday morning, river flooding is not expected. However, many small streams and creeks will be running high into Sunday. Heavy rainfall will cause water ponding in low lying areas and other areas of poor drainage.
In addition to hydrologic impacts, there may also be an elevated landslide risk. These particularly affects those areas that have seen significant tree damage due to then recent and strong east winds.