The cold air wedges underneath a large warm airmass. This causes the warm air to rise up and condensate. The action of the water droplets rubbing together produces a static charge which creates lightning in the storm. The water droplets fall as rain.
Tornadoes are produced by thunderstorms. Most of the thunderstorms that produce tornadoes develop along weather fronts, particularly cold fronts.
warm
warm fronts have in common is that they push the cold fronts up causeing warmer weather.
Cold fronts cause violent weather, including heavy rain, strong winds, and thunderstorms.
Cold fronts are more likely to produce severe thunderstorms and heavy rain that may lead to flooding.
There are warm and cold weather fronts
cold fronts bring sever weather when the temperature differance between the cold air and the warm air cold fronts usally produce thunderstorms with heavy precipitation after a warm front passes it is warm
Tornadoes are most often associate with cold fronts. This is because a cold front can produce convection that leads to strong thunderstorms. Under the right conditions these thunderstorms can produce tornadoes.
It is a period of bad weather.
Tornadoes are produced by thunderstorms. Most of the thunderstorms that produce tornadoes develop along weather fronts, particularly cold fronts.
cold and stormy
cold fronts and warm fronts
No. The description of hot and cold air coming together is based on an oversimplified scenario often given by the media. A collision of hot and cold air simply results in a front. Fronts, particularly cold fronts where cold air pushes away warm air, often result in stormy weather, but the nature of those storms depends on other conditions. In the summer cold fronts often bring thunderstorms, which may be severe. If the storms are strong enough and the winds are configured in the right way, then some of them might produce tornadoes.
cold
Thunderstorms and tornadoes most often form along cold fronts but they can form along dry lines and, on rare occasions, warm fronts. Some may form in the absence of any front.
warm
Tornadoes often, though not always, form along weather fronts, where air masses of differing characteristics collide. The fronts that most commonly produce tornadoes are cold fronts and dry lines.