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Hydrologic Outlook

Hydrologic Outlook

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

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.



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