Peakflow Forecasts Header

BITTERROOT--NEAR MISSOULA
   State:  Montana    County:  MISSOULA
   Latitude:  46 49' 55" North    Longitude:  114 3' 11" West
   Elevation:  3110 feet
   Supporting WFO:  Missoula    
   Action Stage:  10'   Flood Stage:  11'   Moderate Flood Stage:  13'
   Major Flood Stage:  15'

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.

BITTERROOT--NEAR MISSOULA   (BITM8)
Forecasts for Water Year 2027
Ensemble Date: 2026-10-13
 Forecast Period: October 13 to February 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 3.40 940 2026-10-18
90 % 3.40 940 2026-10-18
70 % 3.55 1073 2026-10-29
50 % 3.78 1302 2026-11-06
30 % 4.13 1670 2026-12-05
10 % 5.23 3119 2027-01-13
05 % 6.30 4881 2027-01-26

Peakflow exceedence plot for BITM8

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