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YAKIMA--AT KIONA
   State:  Washington    County:  YAKIMA
   Latitude:  46 15' 11" North    Longitude:  119 28' 37" West
   Elevation:  454 feet
   Supporting WFO:  Pendleton    
   Action Stage:  11'   Flood Stage:  13'   Moderate Flood Stage:  14.5'
   Major Flood Stage:  16'

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.

YAKIMA--AT KIONA   (KIOW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-07-20
 Forecast Period: July 20 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 4.87 3155 2026-08-28
90 % 4.88 3171 2026-08-29
70 % 4.94 3249 2026-08-29
50 % 4.95 3271 2026-08-29
30 % 4.99 3323 2026-08-30
10 % 5.40 3895 2026-09-18
05 % 6.19 5057 2026-10-28

Peakflow exceedence plot for KIOW1

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