11.   If workers cannot safely reach all the holes, shuttle managers could decide to roll Discovery from the launch pad to a hangar and reschedule its mission for August.

12.   If the storm takes a northerly turn into the Gulf of Mexico, it could force NASA shuttle program managers to pull Discovery from the launch pad.

13.   Meanwhile, shuttle managers could establish a new target launch date for Endeavour late this week.

14.   NASA shuttle program managers decided Tuesday to start the countdown after concluding that a dramatic shuttle launch abort last month posed no safety risks for Discovery.

15.   Shuttle managers also revamped their weather criteria for launch, factoring in temperature, humidity, wind speeds, cloud cover, as well as rain and lightning.

16.   Shuttle managers authorized the launch attempt after the line was successfully replaced and tested.

17.   Shuttle managers elected to improve the nozzle assembly process by adding a vacuum device to the process of injecting the rubber insulation during the nozzle assembly.

18.   Shuttle managers ordered the work after nozzle O-rings used on two previous launches displayed evidence of heat damage.

19.   Shuttle managers believe they can have new inspection and repair strategies ready by the end of next week.

20.   Shuttle managers have asked engineers from NASA as well as Utah-based Thiokol Corp., the booster manufacturers, to present their findings and recommendations late this week.