Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda

Tropical Storm Imelda struck the southeast coastal regions of Texas from 17–19 September, 2019, and delivered precipitation above 500 mm over about 6000 km2. The performance three IMERG (Early-, Late-, Final-run) GPM satellite-based products was evaluated against Stage-IV radar estimates. Basic probabilistic statistical metrics, such as CC, RSME, RBIAS, POD, FAR, CSI, PSS were employed to assess products. captured event adequately, with a fairly high POD value 0.9. best product (Early-run) showed an average correlation coefficient 0.60. algorithm used produce Final-run improved quality data by removing systematic errors that occurred in near-real-time Less than 5 RMSE error experienced three-quarters (ranging 73% 76%) area all estimating Imelda. Early-run much better RBIAS relatively product. overall poor, areas acceptable range (i.e., between ?10% 10%) only 16% 17% total area. Overall, found be Late- Final-run.