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
2024
Ensemble Date: 2024-03-28
Forecast Period: March 28 to July 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.23 3982 2024-04-21
90 % 3.34 4189 2024-04-25
70 % 3.66 4826 2024-05-12
50 % 4.05 5655 2024-05-20
30 % 4.85 7580 2024-05-31
10 % 6.10 10675 2024-06-10
05 % 6.61 12068 2024-06-13

Peakflow exceedence plot for PACW1

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