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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
2022
Ensemble Date: 2021-12-08
Forecast Period: December 8 to April 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 6032 2021-12-12
90 % 6032 2021-12-12
70 % 7543 2021-12-29
50 % 12854 2022-01-13
30 % 17192 2022-02-01
10 % 28267 2022-02-24
05 % 31174 2022-03-15

Peakflow exceedence plot for ALRW1

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