Peakflow Forecasts Header

GREEN--HOWARD HANSON DAM
   State:  Washington    County:  KING
   Latitude:  47 17' 0" North    Longitude:  121 47' 0" 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
2022
Ensemble Date: 2021-12-07
Forecast Period: December 7 to April 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 1959 2021-12-26
90 % 2215 2021-12-30
70 % 5187 2022-01-15
50 % 8927 2022-01-31
30 % 13458 2022-02-21
10 % 17272 2022-03-06
05 % 18694 2022-03-29

Peakflow exceedence plot for HHDW1

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