Peakflow Forecasts Header

NEHALEM--FOSS
   State:  Oregon    County:  TILLAMOOK
   Latitude:  45 42' 15" North    Longitude:  123 45' 15" West
   Elevation:  33 feet
   Supporting WFO:  Portland    
   Action Stage:  13'   Flood Stage:  15'   Moderate Flood Stage:  20'
   Major Flood Stage:  24'

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.

NEHALEM--FOSS   (FSSO3)
Forecasts for Water Year 2026
Ensemble Date: 2026-07-10
 Forecast Period: July 10 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 1.96 253 2026-07-29
90 % 2.47 395 2026-10-03
70 % 4.57 1527 2026-10-20
50 % 5.37 2241 2026-10-27
30 % 6.56 3678 2026-10-30
10 % 9.58 9552 2026-11-01
05 % 11.90 16471 2026-11-01

Peakflow exceedence plot for FSSO3

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