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: 2025-07-14
Forecast Period: July 14 to November 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 2.56 682 2025-08-27
90 % 4.34 1869 2025-09-13
70 % 6.47 4326 2025-10-06
50 % 8.20 7326 2025-10-20
30 % 10.35 12284 2025-10-26
10 % 13.53 22202 2025-10-30
05 % 15.15 28487 2025-10-31

Peakflow exceedence plot for TANW1

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