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: 2025-12-06
Forecast Period: December 6 to April 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 4323 2025-12-09
90 % 4323 2025-12-09
70 % 4348 2025-12-17
50 % 5168 2026-01-06
30 % 6392 2026-01-18
10 % 10048 2026-02-05
05 % 10334 2026-02-22

Peakflow exceedence plot for WYDW1

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