lesson 9-3 - An aside: Coldfrontal activity Threestage life...

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An aside: Cold-frontal activity Three-stage life cycle of thunderstorms Developing (or cumulus) stage Cumulus clouds  develop and grow as convection forces air to  rise, creating an updraft. The atmosphere is very unstable. Above the freezing level water  droplets become supercooled to form ice crystals. Rain drops and ice crystals associated with  this stage are small enough to be uplifted. These ice crystals eventually fall when they become  too large to rise in the updraft.  Developing stage of a thunderstorm. This stage typically lasts 10 minutes.  Image source: based on  Lifecycle of a Thunderstorm, NOAA ; BNW [2002] Mature stage : Continued convection produces a massive uplift of air. Where this convection is  most intense the top of the convection bubble is pulled downwind by upper airflow, which forms  an anvil head cloud. The atmosphere is very unstable. Ice crystals and cold rain drops falling to  the ground drag with them cold air, which creates a downdraft. Downdrafts occur at the front of 
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lesson 9-3 - An aside: Coldfrontal activity Threestage life...

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