Peakflow Forecasts Header

NISQUALLY--ALDER RESERVOIR
   State:  Washington    County:  PIERCE
   Latitude:  46 48' 9" North    Longitude:  122 18' 37" West
   Elevation:  1210 feet
   Supporting WFO:  Seattle    
   Inflow Data  

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.

NISQUALLY--ALDER RESERVOIR   (ALRW1)
Forecasts for Water Year
2024
Ensemble Date: 2024-04-25
Forecast Period: April 25 to August 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 2094 2024-04-27
90 % 2094 2024-04-27
70 % 2404 2024-05-09
50 % 2882 2024-05-16
30 % 3732 2024-05-31
10 % 5550 2024-06-14
05 % 6416 2024-06-18

Peakflow exceedence plot for ALRW1

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