Peakflow Forecasts Header

S YAMHILL--NEAR WILLAMINA
   State:  Oregon    County:  POLK
   Latitude:  45 2' 49" North    Longitude:  123 30' 10" West
   Elevation:  236 feet
   Supporting WFO:  Portland    

Forecasts are calculated from a forecast time series that approximates flow at a 6 hour time step interval. Observed instantaneous peaks can be higher than model forecast peaks.

S YAMHILL--NEAR WILLAMINA   (WLAO3)
Forecasts for Water Year
2025
Ensemble Date: 2025-05-12
Forecast Period: May 12 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 2.24 129 2025-05-13
90 % 2.24 129 2025-05-13
70 % 2.24 129 2025-05-13
50 % 2.30 144 2025-05-29
30 % 2.49 197 2025-06-07
10 % 3.32 506 2025-06-15
05 % 3.66 657 2025-07-03

Peakflow exceedence plot for WLAO3

 Click to download runoff traces used in forecast.  Click for comma delimited data used in plot.csv icon