What is the process of convection?

Answer 1

During the daytime the land warms relative to the cooler ocean or lake waters. If the atmosphere is vertically unstable the warm air being less dense than the surrounding air and lifts until condensation forms. A line of clouds and eventually showers and possibly thunderstorms develops. This warming also cause low pressure (by the gas formula) over land and air is pulled in from the ocean or lake. This is called a sea or lake breeze front. Out over the cooler waters the pressure is higher relative to the land and the air sinks and is pushed toward the land and a small scale circulation develops.

After sundown the reverse physical processes occur and the land becomes relatively cooler than the lake or ocean water sometimes and a small scale circulation called a land breeze develops. These are not typically as strong as the sea breeze circulations and less evidence is seen in the form of clouds and showers.

The sea breeze front shows up very nicely in the summertime, especially in Florida and across Cuba. Check your search engine with Sea Breeze front on GOES satellite imagery.