How to Stay Safe in a Supercell Storm

Thunderstorms form when warm air from the surface of the earth rises into upper levels of air that are much cooler —below freezing. As the air rises and cools, it releases heat and forms a cloud. The cloud continues to rise and drop in temperature until it transforms into water droplets and ice. These components are electrically charge — raindrops are usually negatively charged, and ice is usually positive. When these two things combine, lightning is produced and results in sound waves called thunder. Supercell thunderstorms are rare, dangerous storms that produce winds up to 150 to 175 miles per hour and can produce hail as big as 2 inches in diameter. Safety precautions must be taken when a supercell thunderstorm occurs.

Instructions

• 1

  Develop a safety plan and review it frequently. Choose a room in the house to gather family members and pets in during storms. Pick a room in the center of the house (or basement) without windows or glass doors, which can shatter and cause injury. Store emergency supplies in this location: bottled water, flashlights with extra batteries, battery-powered radio and first-aid kits.

• 2

  Be aware of local emergency alert systems and take warnings seriously. Stay inside during thunderstorms and warning periods. If you have ample time, bring items indoors that can potentially become airborne or damaged by hail. Wait at least 30 minutes after the last clap of thunder to resume outdoor activity. Avoid the use of showers, baths and other plumbing during storms — water pipes conduct electricity if struck by lightning.

• 3

  Stay inside your car if driving during a severe storm. Pull off the road in a safe area and put on your hazard lights. Do not touch metal components of the car if lightning is present — it can be conducted inside the car. Do not attempt to drive through a water-covered road — you can become trapped in your car.

• 4

  Stay low to the ground or lay in a ditch if you are caught outside during a severe storm and cannot find shelter. Avoid tall trees, metal poles or fences as these can be struck by lightning and conduct current.