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Severe Weather

QuestionAnswer
What are the main elements that affect weather? Temperature, pressure, humidity, wind, solar energy
What powers weather systems? Solar energy + water
What is a jet stream? Fast-moving wind in upper atmosphere
What is a cyclone? Low-pressure system with rising air
How does air move in a cyclone? Counterclockwise (Northern Hemisphere)
What is a bomb cyclone? Rapidly intensifying cyclone
Pressure drop requirement for a bomb cyclone? 24 mb in 24 hours
What is a blizzard? Strong winds + snow + low visibility
Wind speed requirement for a blizzard? 35+ mph for 3+ hours
What is an ice storm? ≥ 1/4 inch ice buildup
How does lake-effect snow form? Cold dry air moves over warm lake
What happens to the air over the lake? Gains moisture + rises
What causes the snow? Air cools on land → precipitation
What is a thunderstorm? Storm with lightning, thunder, rain
What powers thunderstorms? Latent heat from condensation
When is a thunderstorm considered severe? Winds >58 mph, hail >1 inch, or tornado
What is vertical wind shear? Change in wind speed/direction with height
What 4 conditions are needed for severe thunderstorms? Instability, moisture, lift, wind shear
What is vertical wind shear? Change in wind speed/direction with height
What 4 conditions are needed for severe thunderstorms? Instability, moisture, lift, wind shear
What is a supercell? Powerful storm with rotating updraft
What is a derecho? Long-lasting straight-line wind storm
What is an air mass? Large body of air with similar properties
What happens when air masses move? They change (modify) over surfaces
What is wind chill? Wind makes it feel colder
What is hypothermia? Body temp below 95°F
Created by: user-2027283
Popular Earth Science sets

 

 



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