Answer:
Take shelter in a building, Crouch in a low place, never under a tree,Get out of water as soon as possible and Do not touch electrical equipment.
Step-by-step explanation:
The best step you can take under a thunderstorm time to take a a shelter in the building which protect you from the lighting, tornadoes because thunderstorm will pass by your area about in half an hour but please do not touch or lean against windows.
Get out from the boats or from the water as soon as you see the thunderstorm because there will be more chances of lightning there.
The current will pass to the electric equipment due to the lighting so stay away from the electrical equipment.
Crouch in a low place but never under a tree because trees are very prone to thunderstorms die to high velocities of wind.