Based on the context and the answer, generate a question. 

Context: So . Yesterday was a good day . I had a nice morning and afternoon and I was in a good mood when I went to work . It was really slow so I stood at the counter playing Sudoku and it stormed a little bit so the sky was this gorgeous gray and pink and I was just happy .

Answer:

There had just been a rainstorm



What may be the reason that the sky was gray and pink ?