The National Weather Service has put residents in central and eastern Oregon on high alert for potential landslides and debris flows due to expected heavy rainfall. A Flash Flood Watch is in effect starting from 1:50 p.m. PDT today until 11:00 p.m. PDT September 11. According to the alert, this watch includes central Oregon, the east slopes of the Oregon Cascades, the John Day Basin, the Ochoco-John Day Highlands, and the Southern Blue Mountains. Areas of steep terrain and regions near the remains of recent wildfires are considered to be at high risk.
Rain-induced landslides and debris flows are not only dangerous but also remarkably fast, making them a significant threat to people and property situated along steep slopes and in canyon areas. The National Weather Service warns that "debris flows are rapidly moving, extremely destructive landslides," and they have the potential to "easily travel a mile or more," as mentioned on the Department of Geology and Mineral Industries newsroom. Such velocity is faster than one can manage to run, and given these conditions, vigilance becomes non-negotiable.
For those living or working in the watch areas, the National Weather Service advises staying informed on the situation through various mediums including radio, TV, weather radio, or online. Particularly unsettling sounds such as "trees cracking or boulders knocking together" should serve as immediate warning signs, as mentioned in the Department of Geology and Mineral Industries. Furthermore, changes in the clarity or flow of water in nearby streams and creeks can be a precursor to an incoming debris flow and should prompt a swift evacuation of the area.
In terms of travel, it is critical to proceed with caution. People should generally assume roads may not be safe, and be especially vigilant while driving at night. The terrain next to roadways could fail without warning, potentially sending a flood of rocks and other debris onto the streets. The National Weather Service explicitly instructs, "Travel with extreme caution. Assume roads are not safe," as per the Department of Geology and Mineral Industries newsroom.
