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Gourgoulianis
2-2 Weather
37
Science
7th Grade
05/05/2014

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Term
Air mass
Definition
Large body of air that has properties similar to Earth’s surface over which it forms, can be moist, dry, cold, and warm depending on where it formed
Term
High pressure system
Definition
Rotate clockwise, good weather
Term
Low pressure system
Definition
Rotate counterclockwise, poor weather (rain, snow)
Term
Front
Definition
Boundary between two air masses, always precipitation at fronts
Term
Cold front
Definition
Cold air advances (plows under) towards warm air
Term
Warm front
Definition
Warm air advances (plows over) towards cold air
Term
Stationary front
Definition
Neither one advances (stalement)
Term
Thunderstorms
Definition
Severe rain storms, cumulonimbus clouds.
Damage includes flooding, strong winds, hail
Term
Lightening
Definition
Rapid up & down movement of air causes buildup of charge (like static electricity)
Term
Air mass
Definition
Large body of air that has properties similar to Earth’s surface over which it forms, can be moist, dry, cold, and warm depending on where it formed
Term
High pressure system
Definition
Rotate clockwise, good weather
Term
Low pressure system
Definition
Rotate counterclockwise, poor weather (rain, snow)
Term
Front
Definition
Boundary between two air masses, always precipitation at fronts
Term
Cold front
Definition
Cold air advances (plows under) towards warm air
Term
Warm front
Definition
Warm air advances (plows over) towards cold air
Term
Stationary front
Definition
Neither one advances (stalement)
Term
Thunderstorms
Definition
Severe rain storms, cumulonimbus clouds.
Damage includes flooding, strong winds, hail
Term
Lightening
Definition
Rapid up & down movement of air causes buildup of charge (like static electricity)
Term
Thunder
Definition
Heating up of air by lightening
Term
Where tornadoes are found?
Definition
Found in severe thunderstorms (cumulonimbus clouds)
Term
What is tornado alley?
Definition
Area in Midwest where 90% of Earth’s tornadoes occur
Term
Tornado season
Definition
April to June
Term
What mph can the tornado winds reach?
Definition
300 mph
Term
What is the Fujita scale?
Definition
0-5
Term
Fill in the blank: Hurricanes are the most _____ storms.
Definition
Powerful (low pressure)
Term
How hurricanes occur?
Definition
Form over & fueled by warm water (Atlantic, Pacific)
Term
Where do hurricanes loose power?
Definition
Lose power over land
Term
What are the three types of hurricanes?
Definition
1st- Tropical depression
2nd- Tropical storm (gets named)
3rd- Hurricane (winds over 74 mph)
Term
How many levels are there of hurricane strength?
Definition
Five categories of hurricanes (1-5)
Term
What are blizzards?
Definition
Severe winter storms
Term
What must occur for winter storms to be classified as blizzards?
Definition
1. High winds
2. Low visibility
3. Persist for 3 hours
Term
Meteorologist
Definition
A Person who studies the weather
Term
Meteorology
Definition
The study of weather
Term
Station Model
Definition
A combination of symbols on a weather map
Term
Isotherm
Definition
Line connecting points of equal temperature
Term
Isobar
Definition
Line connecting points of equal pressure
- Closer the lines are together, the higher the wind speed
Term
Barometer
Definition
Instrument used to measure air pressure
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