Step 1: Start a new image with dimensions of 500x400. Make the background color #dbda65 so it looks like this:

Step 2: Create a new transparent layer. Change the color to a dark grey and color so it looks like this:

Step 3: Do a gaussian blur with the settings at 100. It should look like this:

Step 4: Create a new transparent layer and go to Filters > Renders > Clouds > Plasma. Set the turbulence to 1.5. and

Go to Layer > Colors > Desaturate and it should look like this:

Step 5: Set the cloud layer to overlay and you're finished.
It should look somethhing like this:

In case you didn't know, the yellow in the background is supposed to be how the sky looks during a storm.

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