I used some of the same techniques in the composition below, that I used in the Emerging Landscape study a couple of days ago. The transparent iron oxide pigments (yellow and red, in this case) combines the earthiness of the opaque earth tones with transparency of a glaze. The yellow transparent iron oxide makes an nice filter for underlying Prussian blue. The green in the study below comes from this combination.
I used different sponges to lift some of the pigment from the paper. Over these de-pigmeted areas I added a lemon yellow to brighten the horizontal striations.
Unlike the atmosphere, whose amorphous mists often condense with time (as is happening now in California) rendering a clear environment, working with watercolors in abstract mode, details merge with time and allow the viewer to supply his or her own meaning to an amorphous result.