Peakflow Forecasts Header

SF SKOKOMISH--NEAR UNION
   State:  Washington    County:  MASON
   Latitude:  47 20' 25" North    Longitude:  123 16' 43" West
   Elevation:  103 feet
   Supporting WFO:  Seattle    

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.

SF SKOKOMISH--NEAR UNION   (SSUW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-07-11
Forecast Period: July 11 to November 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 0.19 139 2025-09-15
90 % 0.87 366 2025-09-25
70 % 1.19 616 2025-10-19
50 % 1.43 857 2025-10-23
30 % 1.75 1220 2025-10-29
10 % 4.41 6828 2025-10-31
05 % 6.24 12993 2025-11-01

Peakflow exceedence plot for SSUW1

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