Tanking of the space shuttle Atlantis started on schedule at 2:01 am EDT (0601 GMT), and is scheduled to be completed by about 5 am. The weather forecast remains unfavorable, with a 30% chance of acceptable weather. As of 3:30 am there was no rain at or near KSC, although skies are cloudy. Shuttle managers say they are not working any technical issues with the launch.