Download - Fronts and severe weather lecture 22.3
Transcript
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”