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31 Cards in this Set
- Front
- Back
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storms
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violent disturbance in the atmosphere caused by sudden changes in air pressure
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thunderstorms
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heavy rainstorms accompanied by thunder and lightning
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Thunderstorm form within
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large cumulonimbus clouds or thunderheads
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thunderstorm is produced when
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warm moist air is forced updward by a cold front
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thunderheads
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when warm moist air is forced updward by a cold front, as it rises the water condenses and froms thunderheads
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cumulonimbus clouds also form on
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hot, humid afternoons in the spring and summer
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thunderstorms produce strong
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updrafts and downdrafts inside the clouds
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Lightning and thunder
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During a storm, areas of positive and neative charges build up in the storm clouds
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Lightning
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A sudden spark, or energy discharge between parts of a cloud, other clouds, or the ground
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Thunder
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The sound that results from the rapid expansion of air along the lightning strike
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Flash to bang method
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When you see a flash of lightning, count the seconds to bang and that will tell you how far the lightning is from you. Every 5 seconds equals 1 mile
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Tornadoes
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A violently rotating column of air extending from a thunderstorm that touches down to the Earth's surface at a maximum average wind speed of 250 mph
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Causes of tornadoes
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Wind traveling in two different directions causes a layer of air in the middle to begin to rotate like a spinning top
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Tornado watch
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An announcement that tornadoes are possible in the area
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Tornado warning
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An announcement that a tornado has been seen in the sky or on weather radars
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Hurricanes
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Tropical storms that have winds that exceed 74 mph
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Where they form
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They form over warm oceans that is at least 80 degrees farenheit usually formed in the months of April through October
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How they form
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Group of different moving thunderstorms meet and collide over tropical oceans causing the storm to rotate over an area of low pressure
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Storm surge
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A dome of water that sweeps across the coast where the hurricane lands causing the ocean to rise up to 6 meters above normal sea level
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Hurricane names
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Naming hurricanes started in 1953 using women names only, 26 years later male names are being used
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Why they are named
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Greek symbols are used once all the letters in the alphabet have been used up. They are named as they form as tropical storms and the hurricanes name can be used again after 10 years
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Hurricane watch
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An announcement that indicates that a hurricane is on its way and there is a passing threat within 36 hours
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Hurricane warning
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An announcement that a hurricane is coming and will be in the area within 24 hours
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Lake-effect snow
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In the fall and winter, the land near the lakes colls much more rapidly than the water in the lakes
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Air mass
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They get their moisture and temperature characteristics from the area over which they form in
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Characteristics
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They are shown in forms of 2-letter symbols. The first is a lower-case letter, m being maritime and c being continental. The 2nd is an upper-case letter, P being Polar and T being Tropical
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Fronts
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Formed when a cold and warm air mass meet and form a boundary between them
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Cold fronts
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Form when a faster cold air mass meets a slower warm air mass
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Warm fronts
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When a faster warm air mass meets with a cold air mass
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Occluded fronts
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When 3 air masses meet and push up 1 air mass into the middle
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Stationary fronts
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Form when 2 air masses meet and stop
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