The GloFAS Reporting Point layer consists of a queryable map, with pop-out windows providing additional information.

Reporting Point map

The figure below explains the Reporting Points map layer.

For each NWP-driven forecast, a flood probability is computed for each flood threshold using the maximum forecast discharge value over the 30-day forecast horizon. A total probability of exceedance is then computed from these maximum forecast probabilities (from ECMWF-ENS). Dynamic reporting points are finally created (and their alert levels are computed) based on the following rules:

• purple: maximum ensemble mean discharge in the 30-day period is above 20-year
• red: maximum ensemble mean discharge in the 30-day period is between 5-20-year
• yellow: maximum ensemble mean discharge in the 30-day period is between 2-5-year or total probability >20% exceeds 2-year
• grey: diagnostic points identified as important locations by GloFAS users

The shape of the reporting markers is defined as follows:

• circle: no trend of the ensemble mean discharge over the next 30-days

• downward triangle: decreasing trend of the ensemble mean discharge over the next 30-days

• upward triangle: increasing trend of the ensemble mean discharge over the next 30-days

Pop-out windows

Additional local information associated with the reporting point layer is available from the mapviewer as pop-up plots. They display information such as:

• Point geographical information - e.g. country, basin, river and station name.

• Forecast summary - e.g. forecast issue date, probability value and tendency and time to peak.

• Flood hydrographs.

• Summary diagrams of catchment meteorological forcings.

• Consistency diagrams: show the evolution of the forecast signal over time. They display the forecast threshold exceedance for each return period threshold (1.5-, 2-, 5-, 20-year) for each day of the forecast horizon for the latest eight consecutive forecast runs.