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
2027
Ensemble Date: 2026-10-13
Forecast Period: October 13 to February 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.28 3966 2026-11-11
90 % 4.89 8262 2026-11-17
70 % 5.86 11564 2026-12-03
50 % 6.70 14825 2026-12-12
30 % 7.44 18032 2026-12-30
10 % 8.08 21026 2027-01-23
05 % 8.55 23420 2027-01-26

Peakflow exceedence plot for SSUW1

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