Peakflow Forecasts Header

WYNOOCHEE--WYNOOCHEE DAM
   State:  Washington    County:  GRAYS HARBOR
   Latitude:  47 23' 7" North    Longitude:  123 36' 19" West
   Elevation:  810 feet
   Supporting WFO:  Seattle    
   Inflow Data  

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.

WYNOOCHEE--WYNOOCHEE DAM   (WYDW1)
Forecasts for Water Year
2026
Ensemble Date: 2026-06-14
Forecast Period: June 14 to October 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 142 2026-06-29
90 % 177 2026-07-02
70 % 391 2026-08-22
50 % 792 2026-09-13
30 % 1452 2026-09-23
10 % 3022 2026-09-28
05 % 3378 2026-09-30

Peakflow exceedence plot for WYDW1

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