Peakflow Forecasts Header

GRANDE RONDE--NEAR PERRY
   State:  Oregon    County:  UNION
   Latitude:  45 21' 15" North    Longitude:  118 11' 29" West
   Elevation:  2950 feet    Gage Datum:  
   Supporting WFO:  Pendleton    
   Action Stage:  5.8'   Flood Stage:  6.6'   Moderate Flood Stage:  7.5'

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.

GRANDE RONDE--NEAR PERRY   (LGNO3)
Forecasts for Water Year
2022
Ensemble Date: 2021-12-08
Forecast Period: December 8 to April 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 2.19 319 2022-02-09
90 % 2.46 450 2022-02-22
70 % 3.00 815 2022-03-17
50 % 3.40 1163 2022-03-24
30 % 4.00 1777 2022-03-28
10 % 4.63 2516 2022-03-31
05 % 5.21 3304 2022-04-01

Peakflow exceedence plot for LGNO3

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