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
2026
Ensemble Date: 2026-05-12
Forecast Period: May 12 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.50 493 2026-05-14
90 % 3.50 493 2026-05-14
70 % 4.07 757 2026-05-30
50 % 4.88 1262 2026-06-07
30 % 5.58 1824 2026-06-17
10 % 6.49 2757 2026-07-15
05 % 6.98 3353 2026-08-15

Peakflow exceedence plot for SNQW1

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