clouds and fog
cirrocumulus
can be made of ice crystals or small water droplets. hard to spot because they change so often
cumulonimbus
usually at the beginning of a rain or thunderstorm you will see these. they are a dark rolling cloud
nimbostratus
they are a formless cloud with usually a darker color. they cover in sheets
cumulus
low altitude cloud large white or grey usually spread out very visible
stratus
horizontal layering flat usually associated with fog low to the ground