Placeholder page for the new EFAS Reporting Points visualisations as part of EFAS v5.2 release Juan Pereira Colonese and Corentin Carton de Wiart to populate!Page contents are part of the pre-operational release of EFAS v5.2, available on EFAS Stage for testing. See Pre-operational release: EFAS v5.2 for details.
The EFAS Reporting Point layer consists of a queryable map, with pop-out windows providing additional information.
Reporting Point map
The figures below explain the Reporting Points map layer. The definition of the reporting points is given in CEMS-Flood diagnostic and web reporting points.
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The reporting points are created in locations where there is a mapped EFAS station or where the maximum total probability over the forecast horizon indicates chance of floods occurring. The first group is called static reporting points and the latter, dynamic reporting points. The algorithm used to generate dynamic points can be summarised by the following rules:
- A dynamic point will be created at the most downstream location and at the peak signal location of a flood signal of at least 5 pixels.
- Once a dynamic point is created, it stays on the map as long as a flood signal exceeding at least the 2-year return period is detected.
- Points too close to each other are removed (points from previous forecasts will remain).
- If two points are close to each other but are on different rivers (based on the upstream area > 150 km2 network), the two points are kept.
For all types, the alert level associated to a point is determined by the following criteria:
- Has upstream area > 150 km2
- 20-year return period total probability > 30%40%; or
- 5-year return period: total probability > 30%40%; or
2-year return period: total probability > 50%.
For static points with upstream area between 50 km2 and 150 km2, thresholds respectively used to compute the forecast total probability and reporting points, are called 'tiny points'. The alert levels for those points are defined using the same probability thresholds, but they are shown only with a coloured border line.
Pop-out windows
Additional local information associated with the reporting points layers 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 values, persistence values, 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 seven consecutive forecast runs.
Real-time hydrographs (for certain points only): ECMWF-ENS EFAS forecast post-processed based on observed discharge. They also display the probability of exceeding a mean annual maximum discharge within the next 15 days.
Below are some graphical aids to help to interpret and use reporting points' feature information products (these can be found under the Flood Summary layer group - Reporting Points layer, when clicking on a point on the EFAS-IS mapviewer).
Restrictions
EFAS medium-range flood forecasts produced at least 30 days earlier are freely available to view. Real-time EFAS medium-range flood forecasts are only available under certain conditions. Visit the EFAS data access pages to learn more on data restrictions.