If you hear thunder before you reach 30, go indoors. Suspend activities for at least 30 minutes after the last clap of thunder. If you are caught in an open area, act quickly to find adequate shelter. The most important action is to remove yourself from danger.

Why do thunder roars go inside?

When thunder roars, go indoors! ... If you can hear thunder, you can get hit by lightning. Take shelter immediately. If you cannot find a sturdy, fully enclosed building with wiring and plumbing, get into a metal-roofed vehicle.

When thunder roars What does it mean?

1 a loud cracking or deep rumbling noise caused by the rapid expansion of atmospheric gases which are suddenly heated by lightning. 2 any loud booming sound. 3 Rare a violent threat or denunciation. 4 ♦ steal someone's thunder to detract from the attention due to another by forestalling him.