How are they form
The thunderstorm forms a cumulonimbus cloud. Then the cumulonimbus cloud gets a "lift" from a breeze, or a mountain and/or a front. Moisture is trapped in the cloud forming droplets. As the droplets combine and get heavy, they are released from the cloud,creating rain.
In August 2005 there was a tornado that formed from a thunderstorm in Stoughton Wisconsin. It was an F3 level tornado with winds up to 200 hundred miles an hour. There were 27 tornadoes recorded that day,resulting in hundreds of thousands of dollars damage. Devastating the community.
How do people prepare for thunderstorms today
We prepare for thunderstorms by getting warnings on our phones, television, radio and storm sirens. The warnings allow us to track the storm path allowing us time to prepare before the storm hits. Gathering supplies like: flashlights, batteries, candles,matches,blankets,food, water ,a battery operated radio and a safe place to wait out the storm.