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: 2026-03-14
Forecast Period: March 14 to July 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.62 4758 2026-03-20
90 % 3.62 4758 2026-03-20
70 % 3.62 4758 2026-03-20
50 % 3.62 4758 2026-03-20
30 % 4.08 5930 2026-04-01
10 % 5.11 8974 2026-04-16
05 % 6.13 12565 2026-05-02

Peakflow exceedence plot for SSUW1

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