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Automatic Forecast Verification in WSFS
Juha Markkula, Bertel Vehviläinen
SYKE
20.04.23
Automatic Forecast Verification in WSFSWatershed Simulation and Forecasting
System (WSFS) has a separate subsystem to automatically calculate verification graphs and scores for operational forecasts.
This subsystem is called Forecast Accuracy Follow-up System (FAFS)
Forecast Accuracy Follow-up System (FAFS) Verification is based on released operational
forecasts, not on hindcasting FAFS has a web interface where
hydrologists can go back to previous incidents and see how the forecasts succeeded.
FAFS web interface
Lake inflowRiver peak flowAnd less important ones
• Groundwater level• Lake inflow in test model based on monthly/seasonal
weather forecast• Short meteorological temperature forecast
Lake inflow
Lake inflow
Lake inflow
Lake inflow
Lake inflow
Lake inflow
Lake inflowMost important forecast verification criteria
Mean absolute error:
Relative error:Mean absolute error divided by range of observations
Nash – Sutcliffe:
River peak flow
River peak flow
River peak flow
River peak flow
River peak flow
River peak flow
River peak flow
River peak flowDischarge forecast: 7 day lead time,intended to display peak timing error.
River peak flowDischarge forecast: 7 day maximum discharge,intended to display error in peak discharge.
River peak flow
Most important forecast verification criteria
Peak timing error:Mean absolute error in peak timing.
Peak discharge error:Mean absolute error in maximum discharge.