Peakflow Forecasts Header

STILLAGUAMISH--NEAR ARLINGTON
   State:  Washington    County:  SNOHOMISH
   Latitude:  48 12' 13" North    Longitude:  122 7' 41" West
   Elevation:  65 feet
   Supporting WFO:  Seattle    
   Action Stage:  12.5'   Flood Stage:  14'   Moderate Flood Stage:  17.5'
   Major Flood Stage:  
19'

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.

STILLAGUAMISH--NEAR ARLINGTON   (ARLW1)
Forecasts for Water Year
2022
Ensemble Date: 2021-12-07
Forecast Period: December 7 to April 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 11.41 29757 2021-12-12
90 % 11.41 29757 2021-12-12
70 % 11.51 30619 2021-12-21
50 % 13.95 41266 2022-01-10
30 % 15.24 47708 2022-02-06
10 % 18.27 64467 2022-03-06
05 % 18.88 68069 2022-03-23

Peakflow exceedence plot for ARLW1

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