Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
256 PM EDT Wed Mar 11 2026
Day 3
Valid 12Z Fri Mar 13 2026 - 12Z Sat Mar 14 2026

...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL OVER PORTIONS OF
THE PACIFIC NORTHWEST...

19z update: An additional 1-4" of rain is expected across
northwest OR into southwest WA. This will bring 72hr rainfall into
the 3-10" range, likely resulting in at least some minor runoff
concerns even if a lack of instability keeps rainfall rates low.

Chenard

...Previous Discussion...

The on-shore flow which has been anchored along coastal portions
of Washington and northern Oregon will finally start to shift its
focus southward a bit from Friday into early Saturday morning. The
axis of a precipitable water plume with values of 0.75 to 1.00
inches will gradually be shifting southward into Oregon which
allows precipitation rates to weaken farther north. With the rain
moving into an area with drier antecedent condition...maintained a
Marginal Risk area.

Bann

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