Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
731 PM EST Mon Dec 15 2025
Day 3
Valid 12Z Wed Dec 17 2025 - 12Z Thu Dec 18 2025

...THE MARGINAL RISK OF EXCESSIVE RAINFALL AREA LINGERS OVER PARTS
OF THE PACIFIC NORTHWEST. ON WEDNESDAY...

There should be a relative lull in activity across parts of
Washington...Oregon and northern California in the wake of a system
on Tuesday into early Wednesday. Even though there may still be
some rainfall that lingers into Day 3...the Marginal Risk area was
maintained in deference to the approach of the next and seemingly
stronger AR on Day 4 and to account for the possibility that the
guidance could be too slow with the onset of rainfall with this
system. Refer to guidance from the WPC Medium Range Desk for
additional info. Even if the rainfall associated with the next
system does not arrive prior to 12Z Thursday as shown by the
models...any lingering rainfall still has the potential for be
impactful in the most hydrologically sensitive areas.

Cook/Bann

Day 3 threat area: www.wpc.ncep.noaa.gov/qpf/99epoints.txt