Peakflow Forecasts Header

UMATILLA--NEAR GIBBON
   State:  Oregon    County:  UMATILLA
   Latitude:  45 43' 10" North    Longitude:  118 19' 19" West
   Elevation:  1855 feet
   Supporting WFO:  Pendleton    
   Action Stage:  6'   Flood Stage:  7'   Moderate Flood Stage:  9'
   Major Flood Stage:  11.5'

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.

UMATILLA--NEAR GIBBON   (GIBO3)
Forecasts for Water Year 2026
Ensemble Date: 2026-09-08
 Forecast Period: September 8 to January 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 3.05 85 2026-11-12
90 % 3.62 225 2026-11-17
70 % 4.51 598 2026-12-01
50 % 4.72 716 2026-12-07
30 % 5.07 941 2026-12-17
10 % 5.64 1379 2026-12-29
05 % 6.25 1923 2026-12-31

Peakflow exceedence plot for GIBO3

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