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
2022
Ensemble Date: 2021-12-07
Forecast Period: December 7 to April 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 36656 2022-01-05
90 % 42260 2022-02-03
70 % 48842 2022-03-02
50 % 65211 2022-03-22
30 % 77503 2022-03-26
10 % 92491 2022-04-01
05 % 100946 2022-04-01

Peakflow exceedence plot for LGDW1

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