The first word is 预报 (yù bào) which means ‘forecast’. Let’s look at each character of this word, 预 means ‘to predict’ and 报 means ‘report’. A way of using it in a sentence is 天气预报说明天会下雨。(Tiānqì yùbào shuō míngtiān huì xià yǔ.) The weather forecast says it will rain tomorrow.
彩虹 (cǎi hóng) Rainbow
Another word we can create related to 天气 (tiān qì) is 彩虹 (cǎi hóng). This is a noun that means rainbow. A way of using it in a sentence is 彩虹非常漂亮。(Cǎihóng fēicháng piàoliang.) The rainbow is very beautiful.
雷 (léi) Thunder
Finally, we can create the word 雷 (léi) which means ‘thunder’. A way of using it in a sentence is 打雷了，马上就要下雨了。(Dǎléile, mǎshàng jiù yào xià yǔle.) There’s thunder, it’s going to rain very soon.