Peakflow Forecasts Header

SF SNOQUALMIE--NEAR GARCIA
   State:  Washington    County:  KING
   Latitude:  47 25' 0" North    Longitude:  121 35' 0" West
   Elevation:  1448 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 SNOQUALMIE--NEAR GARCIA   (GARW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-05-12
Forecast Period: May 12 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 11.43 375 2025-05-18
90 % 11.43 375 2025-05-18
70 % 11.57 438 2025-05-27
50 % 11.84 574 2025-06-02
30 % 12.35 890 2025-06-10
10 % 13.59 1916 2025-06-27
05 % 13.90 2216 2025-07-13

Peakflow exceedence plot for GARW1

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