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 2025
Ensemble Date: 2025-07-08
 Forecast Period: July 8 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 13.68 749 2025-07-29
90 % 13.70 756 2025-07-29
70 % 13.76 794 2025-10-17
50 % 13.86 891 2025-10-23
30 % 14.16 1389 2025-10-29
10 % 14.96 2720 2025-11-01
05 % 15.22 3160 2025-11-01

Peakflow exceedence plot for NACW1

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