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The Radar-based Flash Flood experimental Products available on EFAS-IS have been developed by the TAMIR and EDERA projects.
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.
Radar-based Flash Flood Products (experimental)
| Product Name | Description | Outputs | Forecast Horizon | Spatial Resolution |
|---|---|---|---|---|
| Radar coverage | Displays the area covered by the OPERA pan-European radar network data for a specific forecast of interest. For more detailed information, check the product page. | Map | N/A - shows data available at time of forecast | 2 km |
| Radar-based Past 24-h Precipitation | This layer shows the 24 hour accumulated precipitation as estimated from gauge-adjusted OPERA radar composites from the pan-European OPERA radar rainfall network blended with short range precipitation forecasted by the ECMWF ensemble. This layer is generated at 00 and 12 UTC every day, the values refer to the total accumulated precipitation in the preceding 24 hours. For more detailed information, check the product page. | Map | Previous 24-hours | 2 km |
| Radar-based Total Precipitation - 80th Percentile | Animated precipitation accumulations forecasted up to 120 hours ahead obtained by seamless blending of radar-based ensemble nowcasts and precipitation forecasts from the ECMWF ensemble. The displayed accumulations correspond to the 80th percentile of the ensemble forecast. For the first 6 hours of the forecast the timestep is 1 hour, thereafter the timestep is 6 hours, and is specified in a box above the animation time slider. For more detailed information, check the product page. | Map Animation | 0-120 hours | 2 km |
| River Flash Flood Products | ||||
| Radar-based River FlashFlood Impact Catchment Summaries | The 90th percentile over each sub-catchment of the maximum gridded flash flood impact level forecasted for four lead time aggregation windows (0-6h, 7-24h, 25-48h, 49-120h). Flash flood impact is based on flash flood hazard forecasts and exposure data. When a sub-catchment is clicked, a pop-up window displays further information about the potential exposure and the location of the forecasted event within the impact matrix. For further information, check the product page. | Map | 0-120 hours | River sub-catchments |
| Radar-based River Flash Flood Impact Forecasts | Animated hourly forecasts of flash flood impact levels over the river network for the next 6 hours, then 6-hourly forecasts until a leadtime of 120 hours. During each timestep each grid cell is shaded according to the combination of the flash flood hazard forecast at that timestep and static exposure data on an impact matrix. For further information check the product page. | Map Animation | 0-120 hours | 1-arcminute (~1.4 km) |
Urban Flash Flood Products | ||||
| 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. For more information check the product page. | Map Animation | 0-5 hours | 1 km |
| 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. For more information check the product page. | Map Animation | 0-3 hours | Ellipses derived from 2 km data |