Peakflow Forecasts Header

MF SNOQUALMIE--NEAR TANNER
   State:  Washington    County:  KING
   Latitude:  47 29' 0" North    Longitude:  121 39' 0" West
   Elevation:  780 feet
   Supporting WFO:  Seattle    

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.

MF SNOQUALMIE--NEAR TANNER   (TANW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-05-12
Forecast Period: May 12 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 5.30 2817 2025-05-18
90 % 5.30 2817 2025-05-18
70 % 5.48 3023 2025-05-26
50 % 6.23 3992 2025-06-03
30 % 7.10 5322 2025-06-11
10 % 9.52 10218 2025-06-25
05 % 10.60 12963 2025-07-09

Peakflow exceedence plot for TANW1

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