Waarschuwingen

Hydrologic Outlook issued November 17 at 1:29PM PST by NWS Portland ORESFPQRA series of storms will bring ample precipitation to NorthwestOregon and Southwest Washington this week. Of particular concern isthe potential for heavy rain Tuesday night through Friday morning,which could result in some flooding for area creeks and rivers.The latest projections of the most likely amounts for storm totalprecipitation are a little lower today than yesterday's forecasts.Amounts range from 3.5 to 6 inches for the Coast, Coast Range, andCascades, with 1.5 to 3 inches for inland valley locations,including Portland, Salem, and Eugene. Upper end projections, withabout a 10 percent chance of occurring, range from 6 to 10 inchesfor the Coast, Coast Range, and Cascades, and 2.5 to 3.5 inches forinland valleys. Snowmelt in the Cascades from 2000 to 4000 feetelevation could add runoff, although runoff from heavy rain would bethe main driver for any flooding that occurs.Rivers will rise starting Wednesday. Small streams andfast-responding rivers could see flooding as early as Wednesdaynight or Thursday, with slow-responding rivers potentially floodingby this weekend. Heavy rainfall will also cause water ponding in lowlying areas and other areas of poor drainage.Monitor weather.gov/portland for the latest updates and any watches,warnings, or advisories that may be issued for this event.

National Weather Service