Typhoons are rotating storm systems that form in tropical areas when warm water mixes with cold air from clouds above. The cold air above pushes on the warm air below, moving it upwards. The warm air and water are pulled... More »

Tropical cyclones, including hurricanes and typhoons, form when calm, warm ocean waters set up a spiraling convection current in the air above the surface. As warm, moist air rises, cooler air moves in to replace it, cre... More »

Typhoons are caused by the cycle of warm air heated by the warm sea water rising, cooling and then being pushed aside by more warm air rising from below. This cycle causes strong winds as air rises quickly when heated by... More »

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 »

Tornadoes form when unstable air in a thunderstorm creates a horizontal rotation in the clouds and strong downdrafts draw that vortex down to the ground. Overlapping fronts can trigger the wind shear necessary to initiat... More »

A blizzard requires three things to form: temperatures below freezing at ground level and in the clouds to allow snow to form, enough moisture to allow clouds and eventually snow to form, and a mass of warm air rising ov... More »

Tornadoes form out of thunderstorms, where moist air rises, cools and condenses into clouds that release heat and force cooler air back down. If the updrafts are strong enough, the feedback loop forms an air vortex that ... More »