Daytime cumulus over land at Silloth

It was a beautiful day at Silloth today. The land has a lower specific heat capacity than the sea so the sunlight raises the temperature of the land more quickly. The air over land is hotter so becomes less dense and rises. The air cools over the sea and falls. The cycle is completed by a lower level sea breeze. This brings in moist air off the sea. This then rises due to the convection previously described. As air rises, it cools. Eventually, the dew point is reached and the water vapour condenses to form cumulus clouds. So during the day the cumulus clouds are above the land. That was obvious today. My source article suggests that the opposite happens at night. I need to observe this. http://www.metoffice.gov.uk/learning/clouds/low-level-clouds/cumulus