1.   Each afternoon the skies darkened and a violent cleansing rainstorm swept the town.

2.   In a few minutes the sky darkened and heavy rain began to fall.

3.   In minutes the sky had darkened and a heavy rainstorm was lacing the fields before me.

4.   The party broke up early when the sky darkened and the first drops of rain fell.

5.   The skies darkened and lightning bolts split the sky.

6.   The skies darkened and the wind grew stronger.

7.   The sky darkened and a few drops of rain fell.

8.   The sky darkened and thunder rolled in from the west.

9.   The sky had darkened and clouds had gathered.

10.   The sky had darkened and thunder rolled in the west.