NASA needs good weather to launch Ares I-X because engineers need to see the rocket flight all the way through first stage separation, which will mark the end of the test.

NASA需要好天气来发射战神I-X，因为工程师们要在第一级火箭分离前观测火箭飞行全过程，第一级火箭分离标志着试飞的结束。

youdao

Officials said the rocket, partially built by Russia would blast off late in the afternoon of Aug. 19, weather permitting, and put into orbit a South Korean-built 22-pound (100-kilogram) satellite.

官员说，如果天气情况许可，总体由韩国建造部分由俄罗斯建造的22磅(100公斤)的火箭将最晚在8月19日下午发射升空，并送入轨道。

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The rocket carrying the satellite lifted off from Tanegashima Space Center in southern Japan early Friday afternoon, following a one-day weather delay.

由于之前的天气问题，运载火箭延迟一天于周五下午在南日本的种子岛航天中心将卫星送入太空。

youdao

The weather was good. The scientists had planned that part of the rocket would fall into the ocean after the launch.

VOA: special.2010.06.27

Yesterday because of bad weather, the helicopters missed their target and hit a rocket dump, sending up enormous blue and green flames.

BBC: 24 February