Peakflow Forecasts Header

SNOQUALMIE--NEAR SNOQUALMIE
   State:  Washington    County:  KING
   Latitude:  47 32' 43" North    Longitude:  121 50' 28" West
   Elevation:  120 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.

SNOQUALMIE--NEAR SNOQUALMIE   (SQUW1)
Forecasts for Water Year
2026
Ensemble Date: 2026-07-15
Forecast Period: July 15 to November 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.95 1091 2026-08-28
90 % 5.60 2666 2026-09-13
70 % 8.44 7062 2026-10-10
50 % 9.85 9974 2026-10-22
30 % 13.02 18296 2026-10-27
10 % 16.65 34249 2026-10-30
05 % 17.67 43323 2026-11-01

Peakflow exceedence plot for SQUW1

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