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CHEHALIS--NEAR CENTRALIA
   State:  Washington    County:  LEWIS
   Latitude:  46 42' 42" North    Longitude:  122 58' 43" West
   Elevation:  185 feet
   Supporting WFO:  Seattle    
   Action Stage:  166'   Flood Stage:  168.5'   Moderate Flood Stage:  172'
   Major Flood Stage:  175.5'

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.

CHEHALIS--NEAR CENTRALIA   (CENW1)
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 % 152.62 459 2025-05-12
90 % 152.63 462 2025-05-20
70 % 153.07 606 2025-06-05
50 % 153.62 810 2025-06-13
30 % 154.62 1243 2025-06-21
10 % 155.92 1960 2025-07-13
05 % 158.20 3709 2025-07-22

Peakflow exceedence plot for CENW1

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