Logo após embarcarem no trem:
Harry, Ron and Hermione went back to their compartment. The thick rain splattering the windows made it very difficult to see out of them.
A situação piorou com o progresso da viagem:
The rain became heavier and heavier as the train moved further north. The sky was so dark and the windows so steamy that the lanterns were lit by midday.
A primeira menção da tempestade em si é logo depois que eles chegaram em Hogsmeade:
Ron's bad mood continued for the rest of the journey. He didn't talk much as they changed into their school robes, and was still glowering when the Hogwarts Express slowed down at last, and finally stopped in the pitch-darkness of Hogsmeade station.
As the train doors opened, there was a rumble of thunder overhead.
Harry Potter and the Goblet of Fire, Chapter Eleven - Aboard the Hogwarts Express