The Mission Management Team gave their unanimous approval this morning to proceed with the launch of Atlantis on Friday morning. However, the weather forecast is getting a little worse: forecasts now are calling for only a 30 percent chance of acceptable weather at launch time, down from 40 percent yesterday. (On the bright side, that means that there’s nearly 1 chance in 3 the weather will be okay. Optimism!) Clouds and the potential for showers and even thunderstorms remain the key weather issues. We should get more details later this morning at the L-2 countdown briefing, starting at 11:30 am EDT and airing on NASA TV.