Everyone left. Why would they stay? After all the sky is dreary. It is cold. Whatever poor light there was is gone and it is not coming back, right? Most of the time that is right, but when you are wrong you might miss something nice. For when special light appears in a dreary scene it makes for great photography. Let's look at an example:

The "special" light just hits El Capitan. Nothing else in this scene gets good light. However, the light on El Capital is orange because the sun is really low behind us shining through an opening in the clouds. It draws the viewer to El Capitan. That small area of orange light is enough to add punch, something special to this image. Unfortunately, only two photographers saw this as everyone else left. What a pity.

          Stay longer. Linger. Just wait a bit. Most of the time nothing will develop but from time to time something does and then it was very worth it to wait.