During a thunderstorm, it is important to stay indoors and avoid windows. If you are outside, seek shelter in a sturdy building or a vehicle. Stay away from tall objects like trees, as they can attract lightning. If you are caught outside with no shelter, crouch down in a low area, such as a ditch, and cover your head. Avoid using electrical appliances and landline phones during the storm, as lightning can cause power surges. Always listen to weather updates and be prepared to take action if conditions worsen.