AWS states that all affected services have recovered.
Starting at 9:57 AM PDT some EC2 instances and EBS volumes experienced a loss of power within a single Availability Zone in the US-EAST-2 Region. Power was restored at 10:19 AM PDT and EC2 instances and EBS volumes began to recover. By 10:23 AM PDT, the vast majority of EC2 instances and EBS volumes has fully recovered and by 11:37 AM PDT, all but a very small number of EC2 instances and EBS volumes had recovered. Elastic Load Balancing shifted traffic away from the affected Availability Zone, which has now been shifted back. RDS impact for single-AZ databases, which have also been recovered. Other services (tagged below) saw impact during the event, but most have fully recovered. Those that are still seeing impact, will provide updates via the Personal Health Dashboard as they work towards full recovery. The issue has been resolved and the service is operating normally.