Peakflow Forecasts Header

CHEHALIS--AT PORTER
   State:  Washington    County:  GRAYS HARBOR
   Latitude:  46 56' 22" North    Longitude:  123 18' 47" West
   Elevation:  24 feet
   Supporting WFO:  Seattle    
   Action Stage:  45.5'   Flood Stage:  48'   Moderate Flood Stage:  50'
   Major Flood Stage:  
52'

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--AT PORTER   (CRPW1)
Forecasts for Water Year
2022
Ensemble Date: 2021-12-08
Forecast Period: December 8 to April 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 46.15 16783 2021-12-13
90 % 46.15 16783 2021-12-13
70 % 47.71 21699 2022-01-01
50 % 48.61 26228 2022-01-13
30 % 49.30 31040 2022-01-24
10 % 51.31 52261 2022-02-17
05 % 51.87 59879 2022-03-04

Peakflow exceedence plot for CRPW1

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