Peakflow Forecasts Header

PILCHUCK--NEAR SNOHOMISH
   State:  Washington    County:  SNOHOMISH
   Latitude:  47 56' 6" North    Longitude:  122 4' 18" West
   Elevation:  0 feet
   Supporting WFO:  Seattle    
   Action Stage:  16'   Flood Stage:  18'   Moderate Flood Stage:  20'
   Major Flood Stage:  
22'

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.

PILCHUCK--NEAR SNOHOMISH   (PILW1)
Forecasts for Water Year
2024
Ensemble Date: 2024-03-28
Forecast Period: March 28 to July 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 11.76 820 2024-03-29
90 % 11.76 820 2024-03-29
70 % 12.13 1067 2024-04-12
50 % 12.46 1330 2024-04-15
30 % 12.67 1518 2024-05-07
10 % 13.09 1923 2024-06-06
05 % 13.32 2167 2024-06-11

Peakflow exceedence plot for PILW1

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