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Amazon says:
Jun 15, 4:03 AM PDT The RDS service is now operating normally. All affected Multi-AZ RDS instances operated normally throughout the power event after failing over. We were able to recover many Single AZ instances successfully, but storage volumes attached to some Single-AZ instances could not be restored, resulting in those instances being placed in Storage failure mode. Customers with automated backups turned on for an affected database instance have the option of initiating a Point-in-Time Restore operation. This will launch a new database instance using a backup of the affected database instance from before the event. To do this, follow these steps: 1) Log into the AWS Management console 2) Access the RDS tab, and select DB Instances on the left-side navigation 3) Select the affected database instance 4) Click on the "Restore to Point in Time" button 5) Select "Use Latest Restorable Time 6) Select a DB instance class that is at least the same size as the original DB instance 7) Make sure No Preference is selected for Availability Zone 8) Launch DB Instance and connect your application We will be following up here with the root cause of this event.