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: 2025-07-02
 Forecast Period: July 2 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 5.67 1692 2025-07-02
90 % 5.67 1692 2025-07-02
70 % 6.44 2562 2025-09-30
50 % 7.26 3552 2025-10-22
30 % 8.29 4834 2025-10-29
10 % 16.05 14989 2025-11-01
05 % 19.84 20589 2025-11-01

Peakflow exceedence plot for RAWW1

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