As relentless rains continue to overwhelm Northwest Oregon and Southwest Washington, the National Weather Service (NWS) in Portland has maintained a flood watch and issued a flood warning for select areas, anticipating significant impacts like riverine and urban flooding along with potential landslides. The NWS alerts, which were disseminated early Sunday morning, signal a week where caution around waterways should be top mind for residents.
Forecasted to persist until late Thursday night, the flood watch highlights that the anticipated "prolonged atmospheric river" is expected to "bring periods of heavy rain to northwest Oregon and southwest Washington Monday through Wednesday," with lighter rain potentially adding to concerns later in the week. The NWS warns that rivers draining coastal mountains and several Willamette tributaries are at risk, carrying a 40 to 80% chance of flooding. Urban flooding, coupled with the increased risk of hydroplaning on roadways, demands vigilance from the public. Moreover, steep terrain and recently burned areas are susceptible to landslides and debris flows, marking a severe risk for those dwelling near such vulnerable zones.
In coordination with the flood watch, the NWS placed a flood warning for the Wilson River near Tillamook, Grays River at Covered Bridge near Rosburg, and Johnson Creek at Sycamore, citing potential minor to major flooding over the course of the next few days. For Johnson Creek, specifically, minor flooding is forecast to escalate by tomorrow evening with "bankfull stage is 10.0 feet." The creek's waters are predicted to rise repeatedly, maintaining a precarious situation well into the midweek.
Residents and motorists have been advised "not attempt to drive around barricades or drive through flooded areas" due to the substantially increased peril faced in such conditions, as per NWS. In the case of Johnson Creek, impacts are anticipated along the creek between SE 92nd Street to SE 122nd Street and again from Johnson Creek to SE Harold Street once water levels surpass 11.0 feet. These warnings underline the NWS’s commitment to prevent the often-underestimated fatalities and injuries that occur in vehicles during flood events.
The area's inhabitants are urged to keep abreast of changing forecasts and be prepared "to take action should flooding develop," as mentioned on NWS.
