The correct answer to this open question is the following.
Unfortunately, you did not include any text, context, article, or any other useful reference to know who is Lewis and his context.
However, we can help you to answer in general terms.
When hearing the emergency tornado and warning announcement, you immediately have to take the proper actions included in your emergency plan.
According to the Occupational Safety and Health Administration (OSHA), it is highly recommended that people and businesses previously develop an emergency plan in ca of a tornado. This way, when a situation like this happens, yo have already know the proper steps to take with calm, instead of panicking for the emergency.
One of the most important things of the plan is to include a place to shelter during the tornado. So you elaborate a risk assessment, prepare a shelter, have enough food and water to spend a couple of days in there, evacuate your home or workplace on time, and lockdown.
