Peakflow Forecasts Header

GREEN--HOWARD HANSON DAM
   State:  Washington    County:  KING
   Latitude:  47 16' 40" North    Longitude:  121 47' 13" West
   Elevation:  1206 feet
   Supporting WFO:  Seattle    
   Inflow Data  

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.

GREEN--HOWARD HANSON DAM   (HHDW1)
Forecasts for Water Year
2024
Ensemble Date: 2024-03-28
Forecast Period: March 28 to July 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 1463 2024-04-05
90 % 1505 2024-04-09
70 % 1833 2024-04-15
50 % 2288 2024-04-24
30 % 2785 2024-05-13
10 % 3718 2024-06-02
05 % 4421 2024-06-07

Peakflow exceedence plot for HHDW1

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