Peakflow Forecasts Header

NACHES--NEAR NACHES
   State:  Washington    County:  YAKIMA
   Latitude:  46 44' 48" North    Longitude:  120 46' 5" West
   Elevation:  1550 feet
   Supporting WFO:  Pendleton    
   Action Stage:  16'   Flood Stage:  17.8'   Moderate Flood Stage:  19'
   Major Flood Stage:  21'

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.

NACHES--NEAR NACHES   (NACW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-08-16
 Forecast Period: August 16 to December 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 13.26 436 2026-09-10
90 % 13.27 444 2026-09-10
70 % 13.34 483 2026-09-14
50 % 14.26 1077 2026-11-03
30 % 14.90 2137 2026-11-13
10 % 16.54 5015 2026-11-24
05 % 16.80 5502 2026-11-28

Peakflow exceedence plot for NACW1

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