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Fronts and severe weather lecture 22.3. Fronts. A front is where masses of air collide. Stationary front. Cold and warm air meet They move side by side along the front. Warm front. Warm air moves up over cold Air cools, forms clouds (cirrus, cumulus) Later, nimbostratus and steady rain. - PowerPoint PPT Presentation
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Warm front
• Warm air moves up over cold • Air cools, forms clouds (cirrus, cumulus)• Later, nimbostratus and steady rain
Cold front
• Cold air moves in under warmer air• Warmer air is pushed up quickly• Thunderstorms, maybe tornadoes
Lightning
• Electrical charges in a cloud can produce a spark.
• Thunder is the shockwave it creates
Tornadoes
Funnels of high-speed wind
Occur in spring, early summer when warm, moist air from Gulf meets cool, dry air from Canada
Hurricanes
• Begin over warm oceans, in late summer
• Energy is released from condensing clouds
• Extreme low pressure in the “eye”