Mysterious colored clouds, (like green, yellow, etc.) high winds, clouds are low and rotating, and the news will tell you or your town's siren (if you have one) will go off.
Not directly. Condensation can trigger thunderstorm. If these thunderstorms are strong enough and encounter the right conditions then they can produce tornadoes.
Tornadoes require a fairly specific set of conditions to develop. The factors have to come together in just the right way.
Tornadoes can pop up anywhere that the weather conditions are just right. They mostly occur in the mid western states such as Kansas, Nebraska, and Oklahoma.
No, they can form any time of the year. The right conditions for tornadoes are just more common during tornado season.
Tornadoes are natural events caused by the right setup of weather conditions. Human-caused climate change may affect where and when tornadoes are most likely to occur, but tornadoes remain a primarily natural phenomenon.
Tornadoes are not a result of oceanic conditions, they are a result of atmosphereic conditions. See the related question for more information.
Because most fires are not intense enough and/or do not coincide with the right wind conditions to form them.
The energy that powers tornadoes ultimately comes from the sun. The sun heats the earth's surface which in turn heats the lower atmosphere. This heat can lead to thunderstorms, which, under the right conditions, can produce tornadoes.
Tornadoes are often associate with a collision between cool, dry air and warm, moist air. This however is not the direct cause of tornadoes. Such collisions produce thunderstorms, which, given the right conditions, can produce tornadoes.
Generally not. Tornadoes form from thunderstorms called supercells, which form under similar conditions to ordinary thunderstorms and as anybody can tell you, thunderstorms don't need to form over an ocean. That said, some tornadoes do form on the ocean.
Tornadoes need the right conditions in order to form. Convective instability, wind shear, and the temperature profile of the air are all factors that must come together in the right way for tornadoes to form. Climate affects all of these factors, so how often tornadoes occur in one area or another is due to climate.
Tornadoes come down to the ground by a lowering wall cloud. It is basically a wall of dark clouds descending. If the conditions are right, it can tighten up to become a tornado.