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 2025
Ensemble Date: 2025-07-11
 Forecast Period: July 11 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 2.73 56 2025-07-25
90 % 2.75 59 2025-08-10
70 % 2.80 66 2025-09-08
50 % 2.87 75 2025-10-01
30 % 2.93 83 2025-10-22
10 % 3.09 106 2025-10-31
05 % 3.80 254 2025-10-31

Peakflow exceedence plot for GIBO3

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