Peakflow Forecasts Header

JOHN DAY--NEAR JOHN DAY
   State:  Oregon    County:  GRANT
   Latitude:  44 25' 7" North    Longitude:  118 54' 21" West
   Elevation:  3131 feet
   Supporting WFO:  Pendleton    
   Action Stage:  7.5'   Flood Stage:  8'   Moderate Flood Stage:  9'
   Major Flood Stage:  
10.5'

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.

JOHN DAY--NEAR JOHN DAY   (JHNO3)
Forecasts for Water Year
2027
Ensemble Date: 2026-10-09
Forecast Period: October 9 to February 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.72 101 2026-11-03
90 % 3.88 145 2026-11-17
70 % 4.09 208 2026-12-13
50 % 4.35 313 2027-01-01
30 % 4.64 449 2027-01-15
10 % 5.44 872 2027-01-28
05 % 5.54 925 2027-01-30

Peakflow exceedence plot for JHNO3

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