Peakflow Forecasts Header

COWLITZ--AT RANDLE
   State:  Washington    County:  LEWIS
   Latitude:  46 31' 57" North    Longitude:  121 57' 20" West
   Elevation:  890 feet
   Supporting WFO:  Seattle    
   Action Stage:  13.2'   Flood Stage:  18'   Moderate Flood Stage:  20'
   Major Flood Stage:  22'

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.

COWLITZ--AT RANDLE   (RAWW1)
Forecasts for Water Year 2025
Ensemble Date: 2025-05-12
 Forecast Period: May 12 to September 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 7.63 3598 2025-05-25
90 % 7.79 3786 2025-05-28
70 % 8.24 4344 2025-06-02
50 % 8.68 4908 2025-06-07
30 % 9.16 5519 2025-06-11
10 % 11.61 8720 2025-06-23
05 % 12.33 9684 2025-06-30

Peakflow exceedence plot for RAWW1

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