When Sherlock was about to jump, the weather changed from sunny to raining. And I say it hadn't stopped since. Because god - who's a pretty busy guy and can't have an eye on everyone & everything all the time - was sad, because he had been kind of looking forward to being outlived by Sherlock trying to have the last word. Only by the time John & Mrs. Hudson were at the cemetery had god noticed that Sherlock's still alive.