why do clouds turn grey when it's going to rain ?

Answer 1

Clouds consist of small water droplets and/or small ice crystals. The size of those droplets and crystals varies. If they are small, the cloud appears white. If they are big, the cloud appears grey. This has to do with the fact that different sizes of droplets/crystals scatter the light differently.

It is much more likely that rain or snow will come from a cloud with large water droplets or ice crystals than from a cloud with small ones. That is, it's more likely that it rains from a grey cloud than from a white one.

Clouds also usually appear more grey than white if they are large (horizontally and vertically), since less sunlight comes through.

Answer 2

Lets see here.... White + Blue = Light blue. Ok that didn't work. The pressure the cloud is having with all the water droplets in the cloud are pushed together and sooner or later fall to the ground as rain.

Answer 3

Clouds are made up of tiny water droplets or ice crystals, usually a mixture of both. The water and ice scatter all light, making clouds appear white. If the clouds get thick enough or high enough all the light above does not make it through, hence the gray or dark look.

Answer 4

Gray clouds don't always mean it's going to rain or snow.

Clouds stay in the air, even though their water drops and ice crystals are heavier than air, because slowly rising air holds up the water drops and ice. When the water drops or ice crystals grow too large for the rising air to hold them up, they begin falling as rain or snow. Often when we see a cloud as gray the water drops or ice crystals aren't large enough to fall.

Answer 5

The clouds are full of moisture.........think about a soaked towel.

Answer 6

only god knows.....