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
2026
Ensemble Date: 2026-06-05
Forecast Period: June 5 to October 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 10.29 133 2026-06-10
90 % 10.29 133 2026-06-10
70 % 10.29 133 2026-06-10
50 % 10.42 166 2026-06-30
30 % 10.82 294 2026-09-21
10 % 11.97 904 2026-09-30
05 % 12.55 1357 2026-10-01

Peakflow exceedence plot for GARW1

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