showers
nimbi
nimbus
"Precipitous" means a cloud brings rain.
the root word is cirus
"RAIN"
Clouds of thunder
Another word for Knapsacks that in 9 letters is backbacks.
I took an umbrella with me as the angry clouds were threatening rain.
By the looks of those clouds, it is obviously going to rain later
Nimbus is Latin for rainstorm, as in Cumulonimbus
an anagram is a word formed from another by scrambling the letters.