Peakflow Forecasts Header

WILLAPA--NEAR WILLAPA
   State:  Washington    County:  PACIFIC
   Latitude:  46 39' 3" North    Longitude:  123 39' 7" West
   Elevation:  4 feet
   Supporting WFO:  Portland    
   Action Stage:  20'   Flood Stage:  21'   Moderate Flood Stage:  22'
   Major Flood Stage:  24'

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.

WILLAPA--NEAR WILLAPA   (WILW1)
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 % 3.55 121 2025-05-12
90 % 3.55 121 2025-05-12
70 % 3.72 148 2025-05-30
50 % 4.48 316 2025-06-08
30 % 4.91 429 2025-06-16
10 % 5.87 721 2025-07-18
05 % 6.28 861 2025-08-22

Peakflow exceedence plot for WILW1

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