Peakflow Forecasts Header

SNAKE--LOWER GRANITE DAM
   State:  Washington    County:  WHITMAN
   Latitude:  46 42' 0" North    Longitude:  117 25' 59" West
   Elevation:  738 feet
   Supporting WFO:  Spokane    
   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.

SNAKE--LOWER GRANITE DAM   (LGDW1)
Forecasts for Water Year
2024
Ensemble Date: 2024-04-25
Forecast Period: April 25 to August 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 101297 2024-05-08
90 % 106382 2024-05-10
70 % 115868 2024-05-17
50 % 121825 2024-05-22
30 % 136657 2024-05-28
10 % 185505 2024-06-07
05 % 194525 2024-06-13

Peakflow exceedence plot for LGDW1

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