Extended radar products are grid datasets that provide information about specific meteorological phenomena, such as the intensity of a convection phenomenon or the presence of hail in conjunction with a thunderstorm. The information provided by these products is more detailed than that of the basic radar products. [interner Link].
The following types of data are available:
- PRECIP-ACCU: Total radar-estimated precipitation over 1, 3, 6, 12, 24, 48 and 72 hours
- POH: Probability of hail, expressed as a percentage
- MESHS: Maximum expected severe hail size (in cm).
- VIL: Vertically integrated liquid [kg/m2]
All extended radar products cover the same region as the basic radar products: Switzerland and neighbouring regions. The five-minute update rate of these products, together with their fast computation speed, makes them suitable for nowcasting systems with high spatial and temporal frequency. The quality tends to be better for Switzerland and for regions close to the border, due to the higher density of radar observations in those areas. The greater the distance from the Swiss border, the less reliable the products.