Weather Fronts
Weather fronts are where two air streams meet. These air steams have different temperatures and humidity. The warmer air, being less dense, rises up over the cooler air. The warm air expands and therefore cools as it rises. Colder air can hold on to less water vapour. The water condenses out of the atmosphere, forms clouds and eventually rain.
Warm Fronts
There are two main types of front. Warm fronts are where warm air "catches up" with colder air. The angle that the warm air moves up is gentle at the warm front. Clouds are slowly formed over a large area and this makes long periods of drizzle. |
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