Beginning on April 6, anomalies in the input SSMIS F17 precipitation estimates were detected in the IMERG Early and Late runs. These anomalies manifest as episodic “swath shaped” areas of high precipitation over land which appear to affect most orbits to some degree. The root cause is degradation in the 37 GHz V polarization channel. On April 13 the issue was somewhat mitigated but we continue to monitor the situation. Please let us know if you detect these (or other anomalies) in the IMERG Early and Late Runs after April 13.