Tropical cyclones form when ambient atmospheric conditions are ripe for storm development, which includes warm ocean waters, moist mid-tropospheric layers, proximity to the equator and the presence of a pre-existing atmo... More »

The hot weather that occurs in summer is caused by the Earth's axial tilt, which affects how much sunlight different parts of the Earth experience throughout the year. During summer in the northern hemisphere, that half ... More »

Hurricanes are caused by the convection currents set up when warm, calm seas heat up the air above the ocean's surface. As the warm, moist air rises, it is replaced by cooler air spiraling down from higher in the atmosph... More » Science Weather & Tides Storms

Like other tropical cyclones, typhoons form when warm, calm ocean waters transfer warmth and moisture to the air above the surface. The air rises into cooler layers of the atmosphere, allowing the water to condense and t... More »

Tropical cyclones form when warm ocean waters heat the air above, causing it to rise and create a low pressure zone. As more air flows in from outside this region, it warms, flows upward and deposits moisture in the form... More »

Because hurricanes use warm, moist air as fuel, they form over warm ocean waters near the equator. According to NASA, a hurricane is a type of tropical cyclone that forms over the surface of the Atlantic or eastern Pacif... More »

Thunderstorms form when the three required atmospheric conditions of sufficient moisture, unstable air and a lifting mechanism are present. In the United States, thunderstorms are most common in the spring and summer mon... More » Science Weather & Tides Storms