Peakflow Forecasts Header

METHOW--AT WINTHROP
   State:  Washington    County:  OKANOGAN
   Latitude:  48 28' 0" North    Longitude:  120 10' 0" West
   Elevation:  1718 feet
   Supporting WFO:  Spokane    

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.

METHOW--AT WINTHROP   (WTHW1)
Forecasts for Water Year
2026
Ensemble Date: 2026-04-18
Forecast Period: April 18 to August 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 14.77 5646 2026-04-23
90 % 14.77 5646 2026-04-23
70 % 14.79 5689 2026-04-29
50 % 15.41 6828 2026-05-11
30 % 15.73 7442 2026-05-17
10 % 16.53 9042 2026-05-26
05 % 16.73 9485 2026-06-01

Peakflow exceedence plot for WTHW1

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