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
2026
Ensemble Date: 2026-06-14
Forecast Period: June 14 to October 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 0.17 156 2026-06-14
90 % 0.17 156 2026-06-14
70 % 0.30 179 2026-07-02
50 % 0.71 327 2026-08-25
30 % 0.94 487 2026-09-24
10 % 1.38 905 2026-09-30
05 % 2.19 1972 2026-09-30

Peakflow exceedence plot for SSUW1

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