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How is a forward-flank downdraft produced?

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As warm,humid air is drawn into the supe...

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Tornadoes that do not occur in association with a mid-level mesocyclone (or a pre-existing wall cloud)of a supercell are called ____________________ tornadoes.​

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nonsuperce...

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When a tornado is approaching from the southwest,its strongest winds are on its ____________________ side.

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southeast
...

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To an observer on the ground,the first sign that a supercell may give birth to a tornado is the sight of _____________________ at the base of the storm.

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A horizontal tube of spinning air,created by vertical wind shear,causes the air near the surface to rotate about a horizontal axis,and is called a mesocyclone.​

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As the air beneath a funnel cloud is drawn into its core,the air cools rapidly and its moisture condenses,and the funnel cloud ascends away from the surface.​

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Even the most powerful twisters seldom have winds exceeding ____ knots.​


A) 90
B) 125
C) ​220
D) ​300
E) ​410

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As warm,humid air is drawn into a supercell tornado,it ____ as it rises.​


A) becomes a rear-flank downdraft
B) becomes a front-flank downdraft
C) ​spins counterclockwise
D) ​spins clockwise
E) ​spins erratically

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The Central Plains region is susceptible to tornadoes because ____.​


A) cool,dry surface air is overlain by warmer,more humid air aloft
B) warm,humid surface air is overlain by cooler,drier air aloft
C) ​cool,wet surface air is overlain by warmer,drier air aloft
D) ​warm,dry surface air is overlain by cooler,wetter air aloft
E) ​warm,humid surface air is overlain by even warmer,and more humid air aloft

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When a large number of tornadoes develop in association with a particular weather system (typically six tornadoes or more,although there is no strict definition),it is referred to as a(n)____________________.​

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Most often,tornadoes form with supercell thunderstorms in an environment with strong ____________________.​

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The deadliest tornadoes are those that occur ____.​


A) over large distances
B) over long periods of time
C) ​in families
D) ​in outbreaks
E) ​in epidemics

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If a downdraft is too ____,it may inhibit the lifting needed for tornado formation.​


A) cold and strong
B) cold and weak
C) ​warm and strong
D) ​warm and weak
E) ​humid and weak

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Explain the types of products the National Weather Service issues in regards to tornadoes.

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The National Weather Service issues seve...

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Gustnadoes form along a gust front where the cool downdraft of a thunderstorm forces warm,humid air upwards.

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As air rushes upward and spins around a low-pressure core of the vortex,the air expands,cools,and,if sufficiently moist,condenses into a ____.​


A) suction vortex
B) mesocyclone
C) ​vortex tube
D) ​tornado vortex
E) ​funnel cloud

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Describe the times of year and times of day when most tornadoes occur in the United States.​

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About 70 percent of all tornadoes in the...

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The most frequent time of day for tornadoes to form is in the ____.​


A) early morning just after sunrise
B) late morning just before noon
C) ​evening just after sunset
D) ​late afternoon
E) ​middle of the night

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The first stage of a tornado's life cycle is the organizing stage.

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Tornadoes have occurred in every state,including Alaska and Hawaii.​

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