High surf today in advance of extremely wet weekend

Rainfall for the 72 hours ending next Monday at 5 a.m. is predicted to total between 5 and 10 inches (designated by red) in much of the Pacific-Clatsop county region.

LONG BEACH — A high-surf advisory remains in effect from 1 p.m. Thursday to 10 a.m. Friday, with offshore wave heights from 19 to 22 feet.

Wave run-up will be much higher than normal and could unexpectedly sweep you off your feet and into the turbulent and frigid waters, according to the National Weather Service in Portland. Avoid walking on jetties, rocks, coastal cliffs and along the water’s edge.

Heavy rain appears likely this weekend across Southwest Washington and Northwest Oregon as a warm front lifts northeast across Oregon and stalls near the Washington border. Meanwhile, a strong and moist Pacific jet stream will run parallel to this front, resulting in areas of heavy rainfall across the Pacific Northwest.

While some details remain uncertain, the NWS said forecast models are showing fairly good agreement in placing the heaviest rain from this event in the higher terrain of southwest Washington and far northwest Oregon. These areas stand to see 3 to 6 inches of rain this weekend, though this precipitation may start out as snow in the higher elevations of the Cascades.

Coastal and lowland areas of southwest Washington are expected to receive 2 to 4 inches of rain this weekend, while the Willamette Valley and Lane County will generally receive 1 to 2 inches. These numbers may still change depending on where the frontal zone stalls. Rainfall totals of this magnitude may be enough to trigger debris flows and landslides in burn scar areas such as those from the Eagle Creek Fire in the Columbia Gorge, as well as for the Whitewater and other recent burns in the Cascades.

While significant rises are expected on many area rivers, mainstem river flooding is not anticipated at this time. However, minor urban and small stream flooding is possible, especially where storm drains are clogged. Creeks and smaller rivers such as the Grays River near Rosburg may be prone to minor flooding as well. The National Weather Service will continue to monitor the rivers closely and issue watches and warnings if needed. People living near Southwest Washington and Northwest Oregon rivers should monitor the latest weather and river conditions for the next week.

Listen to NOAA weather radio or check weather.gov/portland for updates.

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