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 2025
Ensemble Date: 2025-05-14
 Forecast Period: May 14 to September 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 2.76 446 2025-05-18
90 % 2.76 446 2025-05-18
70 % 2.76 446 2025-05-18
50 % 2.96 520 2025-06-01
30 % 3.23 634 2025-06-09
10 % 3.68 852 2025-06-26
05 % 5.19 1938 2025-08-10

Peakflow exceedence plot for FSSO3

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