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 2027
Ensemble Date: 2026-10-09
 Forecast Period: October 9 to February 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 4.29 17465 2026-11-23
90 % 4.58 18822 2026-11-25
70 % 4.90 20429 2026-12-10
50 % 5.81 25357 2027-01-01
30 % 6.78 31125 2027-01-15
10 % 7.71 37387 2027-01-29
05 % 8.71 44516 2027-01-31

Peakflow exceedence plot for ANAW1

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