The CRR is a satellite based product to estimate convective rainfall rate. It is one of the Nowcasting Satellite Application Facility's products developed to monitor convective (and associated stratiform) rainfall in real time - thus every 15 minutes. The CRR combines MSG channels and input from the local version of the Unified Model to derive a rainfall rate. It is similar to the Hydro estimator, but statistics indicate that it is more accurate than the Hydroestimator.