The following Urban Flash Flood products available on EFAS-IS were developed as part of the EDERA project.
Please note that these products are experimental and are not operationally supported. This means that there may be some gaps in their availability due to outages.
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Radar-based Urban Flash Flood Products
Product name | Description (established over forecast horizon) | Outputs | Forecasting horizon |
Radar-based Urban Flash flooding Hazard | Highlights the hourly risk of flash flooding in ~1 km urban grid cells over the next 6 hours. It is generated from nowcasts produced from rainfall observed by the OPERA radar network. Grid cells where urban flash flooding is possible are classed as having low (yellow), medium (orange), or red (high) hazard level. | Map Animation | 0-5 hours |
| Radar-based Intense Precipitation Hazard | Layer shows ellipses where there is a risk of flash flood hazard due to intense precipitation over the next 3 hours. Ellipses are defined where the backscatter value in the OPERA radar observation is greater than 35 dBZ, indicating a risk of intense precipitation. Ellipses are shaded according to the potential hazard level estimated using a machine learning model trained on impact observations. The ellipses fade out with increasing lead time to represent the increasing forecast uncertainty in the location of the affected area. | Map Animation | 0-3 hours |