Peakflow Forecasts Header

SNAKE--NEAR ANATONE
   State:  Washington    County:  ASOTIN
   Latitude:  46 5' 49" North    Longitude:  116 58' 36" West
   Elevation:  807 feet
   Supporting WFO:  Spokane    
   Action Stage:  19'   Flood Stage:  20'   Moderate Flood Stage:  23'
   Major Flood Stage:  24'

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--NEAR ANATONE   (ANAW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-03-10
 Forecast Period: March 10 to July 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 9.09 47389 2026-04-21
90 % 9.64 51705 2026-04-26
70 % 10.46 58384 2026-05-04
50 % 11.56 67809 2026-05-22
30 % 13.31 83943 2026-05-28
10 % 14.71 97167 2026-06-05
05 % 16.13 110658 2026-06-09

Peakflow exceedence plot for ANAW1

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