Peakflow Forecasts Header

NF SNOQUALMIE--NEAR SNOQUALMIE FALLS
   State:  Washington    County:  KING
   Latitude:  47 37' 0" North    Longitude:  121 43' 0" West
   Elevation:  1130 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.

NF SNOQUALMIE--NEAR SNOQUALMIE FALLS   (SNQW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-07-12
Forecast Period: July 12 to November 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 2.77 244 2025-08-16
90 % 3.66 580 2025-08-25
70 % 5.70 1938 2025-10-06
50 % 6.75 3070 2025-10-22
30 % 7.67 4332 2025-10-25
10 % 9.26 7166 2025-10-29
05 % 9.78 8288 2025-10-31

Peakflow exceedence plot for SNQW1

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