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: 2026-04-14
 Forecast Period: April 14 to August 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 15.79 3146 2026-04-18
90 % 15.85 3256 2026-04-28
70 % 16.16 3782 2026-05-04
50 % 16.54 4466 2026-05-09
30 % 16.87 5102 2026-05-16
10 % 17.36 6032 2026-06-03
05 % 17.70 6687 2026-06-10

Peakflow exceedence plot for NACW1

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