PORTLAND -- A forecast of heavy rain, combined with already-saturated soil, led Oregon officials to issue a warning for possible landslides in many areas of the state through the weekend.
The Oregon Department of Geology and Mineral Industry issued the warning Thursday, shortly after the National Weather Service issued a Special Weather Statement calling for heavy rain in most of northern Oregon and southwest Washington through Friday evening.
Best estimates of total rainfall through Friday evening are for 2 to 5 inches along the coast, coastal mountains and the Cascades, the National Weather Service statement read. Rainfall amounts of .75 inches to 1.50 inches are likely for other areas.
The areas at highest risk for landslides included especially in the Coast Range, Willapa Hills, North Oregon Cascades, and Columbia River Gorge.
A cold front after that will lower the snow level, according to the NWS statement.
Several inches are possible at major pass levels in the Cascades beginning Friday night through the weekend, with 1 to 2 feet at higher elevations, it reads.
KGW Meteorologist Nick Allard said the rainy conditions in the metro area are expected through the weekend, without much relief in the 7-day outlook.
I expect a few more sunbreaks for the beginning of next week, but it looks pretty wet overall, Allard said.
According to the Oregon Department of Geology and Mineral Industries (DOGAMI), the most dangerous places include:
- Canyon bottoms, stream channels, and areas of rock and soil accumulation at the outlets of canyons.
- Bases of steep hillsides.
- Road cuts or other areas where slopes of hills have been excavated or over-steepened.
- Places where slides or debris flows have occurred in the past.