Waarschuwingen, Mount Hood

Hydrologic Outlook issued February 21 at 3:52AM PST by NWS Portland OR ESFPQR An series of frontal systems will bring heavy rainfall to northwest Oregon and southwest Washington this weekend. Rain will begin Saturday afternoon, and intensify overnight through Sunday. This will lead to rises on rivers and creeks, especially along the coast on February 22nd through the 23rd. Main stem rivers may be delayed to respond, and flooding may occur beyond this time frame. There is around a 20-25% chance of the Wilson River, the Grays River, and other localized quick responding coastal rivers of reaching minor flood stage on Sunday. Confidence in flooding is low as the location of heaviest precipitation will greatly depend on where the warm front sets up. In the case that this system over performs, more widespread flooding is possible. Heavy rainfall along the Cascades is expected and combined with recent snow accumulation, there is elevated landslide risk. Heavy rainfall may also lead to ponding of water, general lowland flooding, and localized urban flooding, especially in low-lying areas or other poor-drainage areas. Heavy rainfall will also increase the potential for landslides in areas of steep terrain and debris flows over areas that have been burned by wildfires over the past few years. Shifts in the forecast storm track can change the outlook and probabilities for river flooding, so be sure to monitor weather.gov/portland for the latest weather updates, as well as any watches, warnings, or advisories that may be issued. To view the latest river forecasts, visit water.noaa.gov/wfo/pqr.