Here is a reference for all pilots of what to expect from the weather by looking at the clouds. These pictures have been referenced to southern hemisphere weather conditions .
Vertical development is a good indication for lift.
If clouds form in the NW to SW there is a likelihood of gusty winds and showers in 5 to 10 hr. This is the lead up to thunderstorms. Can become dangerous to pilots due to 'cloud suck'. If found ahead of a cold front, expect strong gusty winds and showers within 5 to 10 hr. This pattern looks like inverted mini cumulus clouds, which are caused by turbulent up and down drafts.