Bad weather can make for great photos. Especially in the summer when in many parts of the USA, you get dramatic thunderstorms and big cloud formations.
If you want to make great weather shots, remember that the weather, NOT the foreground is your subject. Include no more than 25% of the foreground in your frame, less if possible. (One major exception to this is a photo that includes water. In this case, you may want more foreground than background.)
And don’t even think of using autofocus for these types of shots. Switch to manual focus, set it on infinity and forget about it. Hopefully that tornado you’re trying to capture on film is far enough away that you don’t need to think about anything but infinity focus.
Your lens choice should be somewhere in the short to medium telephoto range. Fisheye lenses can be fun if you have a wild sky. And of course, use a tripod. There’s no chance of getting a solid shot otherwise.
If you want to get creative, use a small aperture and low shutter speed to make motion blurs. Otherwise, think high ISO settings since you probably won’t have tons of light.