Illustrating water is more challenging, since it has many properties and is often kinetic. Key to the effective illustration of water is observing and understanding how it moves and reflects light. To aid the dynamics, use a low-porous paper that will absorb moisture slowly. Working quickly with broad strokes, select compatible colors and let them overlap slightly. The colors will tend to diffuse into each other so try using a cotton swab to feather the edges.
Extreme weather poses unique opportunities and challenges when working with markers.
In most cases, a limited range of colors will suffice to capture most effects, since stark contrast helps create more powerful images. For example, instead of hundreds of raindrops, it may help to illustrate a large, dark sky with only a few drops. This helps suggest the birth of a storm on the verge of an imminent deluge. Keep in mind that some raindrops will catch and reflect light while others block it and appear dark. Snow can be illustrated by using blue and Ice blue markers on white paper, which serves as a base color.