How do children draw when it rains heavily?

For a stormy picture, we can first conceive the things involved in this picture, and then build the picture with things, so that we can draw a stormy picture.

Rain is the first thing in the storm scene, which means bad weather. Bad weather can be indirectly manifested as overcast clouds, but it will rain, so there can be lightning. Therefore, a cloudy sky can be built by rain. There are lightning in the sky and rainy weather at the same time.

For expressing the wind, we can try to describe the wind with willows or other floating things, and superimpose the two pictures of wind and rain to produce one picture, that is, the picture of wind and rain.

To sum up, we can produce pictures of stormy weather by superimposing pictures describing the wind and pictures describing the rain.