One product issued by NWS for: Pasco WA
Hydrologic Outlook
Hydrologic Outlook ORZ041-044-049-050-502-503-505>511-WAZ024-026>030-521>523-042300- Hydrologic Outlook National Weather Service Pendleton OR 1047 AM PST Sun Dec 3 2023 ...Significant in-banks rises on many area rivers and streams this week... An atmospheric river event has begun across the area and will continue though Wednesday. It will bring abundant moisture and rising temperatures to the region. High temperatures by Tuesday will be 10 to 20 degrees above normal. These temperatures will cause rising snow levels through early Wednesday before snow levels decrease again. Current snow levels range from around 5000 feet in the Washington Cascades and Wallowa Mountains to between 6500 and 8000 feet elsewhere. Snow levels will continue to rise and peak at over 9000 feet later Monday into Tuesday, before starting to decrease over the Washington Cascades. As a result, any precipitation will fall as rain on the newly established snowpack, creating runoff. About 1 to 2 inches of rain is expected over the mountains today an through Monday night with locally higher amounts in the Washington Cascades. An additional 1 to 1.5 inches, with local amounts up to 2 inches is expected Tuesday into Wednesday. Significant rises are expected on many area rivers and streams, though no mainstem river flooding is anticipated, at this time. Based on the current forecasts, the following rivers are expected to reach or exceed action stage by midweek... The Naches River at Cliffdell The Naches River near Naches If rainfall ends up being higher than current forecasts, then additional rivers could reach bankfull. This Hydrologic Outlook will be updated by Monday afternoon with any pertinent updates concerning hydrologic conditions. $$ LN