Peakflow Forecasts Header

WALLA WALLA--NEAR TOUCHET
   State:  Washington    County:  WALLA WALLA
   Latitude:  46 2' 0" North    Longitude:  118 44' 0" West
   Elevation:  405 feet
   Supporting WFO:  Pendleton    
   Action Stage:  10'   Flood Stage:  13'   Moderate Flood Stage:  15'
   Major Flood Stage:  
17'

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.

WALLA WALLA--NEAR TOUCHET   (TCHW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-05-12
Forecast Period: May 12 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 5.02 606 2025-05-14
90 % 5.02 606 2025-05-14
70 % 5.02 606 2025-05-14
50 % 5.17 677 2025-05-28
30 % 5.73 968 2025-06-03
10 % 7.04 1860 2025-06-09
05 % 7.82 2419 2025-06-11

Peakflow exceedence plot for TCHW1

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