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: 2026-01-23
Forecast Period: January 23 to May 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 11.42 617 2026-02-04
90 % 11.49 658 2026-02-08
70 % 12.16 1116 2026-02-16
50 % 12.66 1535 2026-03-11
30 % 13.36 2180 2026-04-09
10 % 14.65 3550 2026-04-28
05 % 15.62 4625 2026-04-30

Peakflow exceedence plot for GARW1

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