Here's an explanation of how to choose conservative values for these and other inputs, when you don't have exact values. These restrictions help to prevent you from inadvertently entering an unrealistic input value. It's the heating of the substrate below the atmosphere that generates convection, which in turn reduces stability.
Ground heats up relatively quickly.
For that reason, there's much less convection over water than land, even on a sunny day. Then I had to reset the source. In some cases, however, it cannot, so it asks you to reenter information about the source. For example, by increasing air temperature, you may cause a tank to be filled to more than 100 percent of capacity, or a puddle's temperature to increase above its boiling point. In such cases, you must enter new source information to resolve the problem.