Turbine let us know about some maintenance they have scheduled for Monday:

All Turbine services will be down on Monday June 9th from 7am - 11am Eastern (-4 GMT) for maintenance. During this time the game, billing and authentication servers will be offline. In addition, all Turbine forums will be viewable, but players may not be able to log into their accounts.

Might be a good time to head out and dodge some tornados!