Weather is a condition of air around us. An air mass is a bdoy of air, of enough normal temperature and moisture, that extends over an area of at least 1,000 sq km (400 sq mi). air masses are hiddden by temperature as hot or cold. A FRONT will happen where air masses meet.

The word tornado probably comes from the Spanish word tronada meaning "thunderstorm". Tornadoes are also called twisters or cyclones and are formed by rapidly rotating columns of air hanging from cumulonimbus clouds. They ar usually observed as tube or funnel-shaped clouds. At ground level they usually leave a path of destruction only about 50 m (170 ft) wide and travel an average of only about 8 to 24 k (5 to 15 mil). Ground contact is often of a repeated nature lasting usually less than a couple of minutes in any particular area because the funnel skips along. Tornadoes usually perform a certain speed cycle of behavior between formation and final disappearance. The first sign of a tornado may be a strong whirlpool of dust from the ground's surface, often in the appearnace of a short funnel growing from the storm cloud above it. The funnel then becomes more organized and less further from the cloud, sometimes touching the ground. The funnel, as a whole, commonly moves forward slowly but can travel at speeds greater than 30 m (100ft) per second. The tornado finally becomes trash and disappears.