Peakflow Forecasts Header

NF STILLAGUAMISH--NEAR ARLINGTON
   State:  Washington    County:  SNOHOMISH
   Latitude:  48 15' 42" North    Longitude:  122 2' 47" West
   Elevation:  89 feet
   Supporting WFO:  Seattle    
   Action Stage:  10.7'   Flood Stage:  13'   Moderate Flood Stage:  14'
   Major Flood Stage:  15'

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.

NF STILLAGUAMISH--NEAR ARLINGTON   (ARGW1)
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 % 10.44 15199 2021-12-12
90 % 10.44 15199 2021-12-12
70 % 10.94 17112 2021-12-28
50 % 11.93 22496 2022-01-15
30 % 12.46 25915 2022-02-02
10 % 13.66 34632 2022-03-06
05 % 14.05 37766 2022-03-23

Peakflow exceedence plot for ARGW1

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