Peakflow Forecasts Header

COWLITZ--AT PACKWOOD
   State:  Washington    County:  LEWIS
   Latitude:  46 37' 0" North    Longitude:  121 40' 59" West
   Elevation:  1048 feet
   Supporting WFO:  Seattle    
   Action Stage:  8.2'   Flood Stage:  10.5'   Moderate Flood Stage:  11'
   Major Flood Stage:  
12'

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 PACKWOOD   (PACW1)
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 % 2.68 2776 2021-12-12
90 % 2.94 3186 2021-12-21
70 % 4.70 6781 2022-01-07
50 % 6.18 10572 2022-01-25
30 % 7.94 15568 2022-02-12
10 % 9.42 20458 2022-03-13
05 % 11.14 26895 2022-03-19

Peakflow exceedence plot for PACW1

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