In some parts of the world, these powerful storms are a regular occurrence. The United States alone experiences more than 1,000 tornadoes a year, and the storms have originated on every continent except Antarct
The powerful upward thrust of the expanding gases propels pyroclastic material as high as 30 miles (48 km) in the air, at hundreds of feet per second. The eruption, which can last hours or even days, produces a towering, sustained eruption plume. This dumps a huge amount of tephra, ...
Interestingly, this means very powerful tornadoes can receive low EF ratings if they fail to run across anything significantly strong to destroy. The Saffir-Simpson Hurricane Wind Scale places hurricanes into one of five categories according to their sustained wind speeds at a given time. It also ...
Results show that some of the severe localised storms in Malawi are tornadoes. This first attempt in Malawi to characterise these emerging storms will emphasise the need for improved tornado forecasting capacity, documentation of occurrence and effects, and awareness raising on risk reduction.Chiotha,...
In some parts of the world, these powerful storms are a regular occurrence. The United States alone experiences more than 1,000 tornadoes a year, and the storms have originated on every continent except Antarctica [source: Tarbuck]. While most storms are weak and occur in sparsely populated ...
As climate change stokes larger and more intense wildfires, firestorms are likely to become more common. Here’s why they occur and what makes them so dangerous.
Tornadoes begin with a thunderstorm but not just any thunderstorm.龙卷风的开始是雷暴，但是却不止是普通的雷暴。These are especially powerful, towering thunderstorms called supercells.非常强大，非常激烈的雷暴，被称为超级雷暴云。Reaching up to over 50,000 feet, they bring high force winds, giant ...
Further north, tornadoes are more common through the summer months [source: National Severe Storms Laboratory]. Storm chasers who don't live in the area will set up camp in a hotel room or other rented space. Before bed and first thing in the morning, storm chasers check weather reports ...
There are two main ingredients needed for hurricanes to spawn tornadoes, which add to the destructive potential of a storm. The first is instability created by heat and humidity in the atmosphere. The second is differences in wind speed and direction at different altitudes, known as wind shear....
2. Tornadoes Tornadoes form when warm and cold air collide during big thunderstorms. This collision can force the wind to start spinning in a circle. When a tornado comes, it can be extremely destructive, like a powerful giantvacuum cleanerthat sucks up everything in its path. ...