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: 2026-04-18
 Forecast Period: April 18 to August 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 178.46 537 2026-04-18
90 % 178.46 537 2026-04-18
70 % 178.46 537 2026-04-18
50 % 178.84 654 2026-05-07
30 % 179.39 834 2026-05-23
10 % 180.26 1130 2026-06-08
05 % 181.12 1443 2026-06-15

Peakflow exceedence plot for CTAW1

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