Air Masses
Fronts
Thunderstorms
Hurricanes
Tornadoes
100
A warm air mass that forms at low latitudes
What is a tropical air mass?
100
This is the average size of weather fronts
What is 15 to 200 kilometers wide?
100
These two effects are generated by thunderstorms
What are lightning and thunder?
100
Hurricanes typically occur during this time of year
What is late Summer?
100
Tornadoes occur most commonly in this season
What is Spring?
200
The common size of an air mass
What is 1,600 kilometers or more across?
200
A front is a ____________ that separates two air masses
What is a boundary?
200
Thunderstorms form when this rises in an unstable environment
What is warm, humid air?
200
Hurricanes are known in other parts of the world by this different term
What is a typhoon?
200
Tornadoes can cause severe winds up to this speed
What is 480 kilometers per hour?
300
In addition to overall temperature, air masses are classified according to this
What is the surface over which they form?
300
In this type of front air flow is almost parallel to the line of the front, and the position of the front does not move
What is a stationary front?
300
This is the estimated amount of thunderstorms currently in progress on Earth at any given moment
What are 2,000?
300
Hurricanes are defined in the United States as whirling tropical cyclones that produce winds of at least this speed
What is 119 kilometers per hour?
300
Tornadoes are violent windstorms that take the form of a rotating column of air referred to as this
What is a vortex?
400
These types of air masses are humid
What are maritime air masses?
400
This type of front is produced when an active cold front overtakes a warm front
What is an occluded front?
400
Thunderstorms occur most frequently in this part of the United States
What is Florida and the eastern Gulf Coast?
400
Hurricanes form over these specific regions
What are Earth’s tropical oceans?
400
Most tornadoes form in combination with this other type of storm
What is a thunderstorm?
500
An area over which an air mass gets its characteristic properties of temperature and moisture
What is source region?
500
These weather systems are large centers of low pressure that generally travel from west to east and cause stormy weather
What are middle-latitude cyclones?
500
The development of a thunderstorm usually involves 3 stages. The final stage where a thunderstorm cools and dies down is called this
What is the dissipating stage?
500
Hurricanes are becoming a growing threat because more people are living and working in these areas
What are the coasts/shorelines?
500
This place in Oklahoma monitors tornadoes and other severe weather activity to alert people of possible danger
What is the Storm Prediction Center (SPC)?
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