Radar nowcasting uses vector motion tracking to extrapolate movement of precipitation fields in the radar images. It is quite accurate at predicting movement of frontal precipitation fields and small scattered precipitation cells. Radar nowcasting is less accurate in predicting convective and orographic precipitation, which may form and disaggregate within few hours. For these types of precipitation, forecasting with numerical models is usually more accurate beyond 2 hours ahead, although accuracy levels are always lower than for frontal precipitation.
Our predictability indices explain more about these uncertainties.
meteoblue has developed radar forecasting algorithms which allow us to calculate precipitation nowcasts and provide realtime estimates from radar observations that do not arrive with some delay. Applying these nowcasting routines to all available radar and satellite data enabled us to generate a full European composite (radar map) in realtime since August 2019.
This composite is now shown as a map superimposed on the satellite cloud cover image available on our front page.