Well, while I am avoiding my Spanish homework, I will answer this question. If you are referring to sights as in what you see in your command, then you'd probably see people running towards their car or any type of shelter to keep themselves dry, warm, and out of danger. Depending on what type of storm it is, then you'd probably see lightning paint the sky or probably objects flying and trash swirling around if there were to be a tornado or really high winds. You'd hear thunder crack every now and then, and if the storm is that awful, one or two people screaming. Some like to keep the radio on so you'd hear news anchors reporting on the storm or maybe voices traveling calling out to people. A child or easily frightened individual might feel scared or maybe mad or sad they can't participate in outside activities. I can say personally say during hurricane Irma, I was quite bored. And I felt sluggish laying around all day watching nothing but movies and using the last of my phone battery to play useless games.
A biker's helmet is often called a brain bucket. Not wearing one is literally, "a no brainer." The pun also implies that one riding a bike without a helmet has no brains.
