Peakflow Forecasts Header

MF FLATHEAD--NEAR WEST GLACIER
   State:  Montana    County:  FLATHEAD
   Latitude:  48 29' 43" North    Longitude:  114 0' 33" West
   Elevation:  3129 feet
   Supporting WFO:  Missoula    
   Action Stage:  9'   Flood Stage:  10'   Moderate Flood Stage:  14'
   Major Flood Stage:  
18'

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 FLATHEAD--NEAR WEST GLACIER   (WGCM8)
Forecasts for Water Year
2026
Ensemble Date: 2026-02-14
Forecast Period: February 14 to June 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 5.38 8749 2026-05-05
90 % 5.60 9528 2026-05-12
70 % 6.09 11293 2026-05-19
50 % 6.45 12600 2026-05-27
30 % 6.77 13802 2026-05-30
10 % 7.20 15380 2026-06-01
05 % 7.40 16117 2026-06-01

Peakflow exceedence plot for WGCM8

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