大雨如注。

It was teeming with rain.

雷鸣电闪，大雨如注。

Thunder lightning, heavy rain, such as injection.

大雨如注，电光闪闪，雷声隆隆。

It poured and it lightninged. It thundered! It rumbled.

这倒霉的天气，刚才还是晴空万里，一会儿的功夫竟是电闪雷鸣，大雨如注。

This wretched weather, or just blue skies, while the effort was actually lightning, rain fell in torrents.