Peakflow Forecasts Header

SKOOKUMCHUCK--AT CENTRALIA
   State:  Washington    County:  LEWIS
   Latitude:  46 43' 49" North    Longitude:  122 57' 14" West
   Elevation:  100 feet
   Supporting WFO:  Seattle    
   Action Stage:  187'   Flood Stage:  189'   Moderate Flood Stage:  190'
   Major Flood Stage:  191'

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.

SKOOKUMCHUCK--AT CENTRALIA   (CTAW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-07-20
 Forecast Period: July 20 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 177.19 184 2026-07-20
90 % 177.20 186 2026-07-27
70 % 177.31 214 2026-08-23
50 % 177.55 277 2026-10-15
30 % 178.00 401 2026-10-27
10 % 179.32 811 2026-11-01
05 % 179.75 954 2026-11-01

Peakflow exceedence plot for CTAW1

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