Peakflow Forecasts Header

LEMHI--NEAR LEMHI
   State:  Idaho    County:  LEMHI
   Latitude:  44 56' 24" North    Longitude:  113 38' 16" West
   Elevation:  4960 feet
   Supporting WFO:  Missoula    
   Action Stage:  6'   Flood Stage:  6.5'   Moderate Flood Stage:  8.5'
   Major Flood Stage:  
10'

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.

LEMHI--NEAR LEMHI   (LERI1)
Forecasts for Water Year
2026
Ensemble Date: 2026-02-06
Forecast Period: February 6 to June 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 4.25 289 2026-04-28
90 % 4.31 307 2026-05-06
70 % 4.51 373 2026-05-22
50 % 4.65 440 2026-05-28
30 % 4.78 504 2026-05-31
10 % 5.10 670 2026-06-01
05 % 5.35 820 2026-06-01

Peakflow exceedence plot for LERI1

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