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Air Masses
Air Masses, Tornados, and Hurricanes
Question | Answer |
---|---|
cold, dry air mass coming from Canada | continental polar |
bitterly cold, dry air mass coming from Alaska | Arctic |
warm, dry air mass coming from Mexico | continental tropical |
warm, moist air mass coming from the Gulf of Mexico | maritime tropical |
warm, moist air mass coming from the southern region | maritime tropical |
cold, moist air mass coming from the northern region | maritime polar |
a large body of air that has properties similar to the part of the Earth's surface over which it develops | air mass |
Where do moist air masses come from? | over water |
Where do dry air masses come from? | over land |
What type of weather comes from high pressure areas? | fair weather because the sinking motion of the air makes it difficult for air to rise and clouds to form |
What type of weather comes from low pressure? | cloudy and stormy with strong winds |
a boundary between two air masses of different density, moisture, and temperature | front |
type of weather from a cold front | thunderstorms |
type of weather from a warm front | long periods of gentle rain |
front that forms when a warm air mass and a cold air mass meet and neither can move the other | stationary front |
Cold air rapidly moves into a land area of warm air. What type of weather would most likely occur? | thunderstorm |
front that causes thunderstorms | cold |
front that is not moving and causes several days of rain | stationary |
What does a hurricane gain strength from? | the heat and moisture of the warm ocean water |
type of pressure system needed for a hurricane or tornado | low pressure |
type of water needed for a hurricane to form | warm (80 degrees or warmer) |
warning time for a tornado vs. a hurricane | You can know about a hurricane days to weeks in advance, but you only know about a tornado minutes to hours in advance |
a tropical cyclone with high winds, rain, thunder, and lightning | hurricane |
a rotating funnel-shaped column of air that has a very high speed of winds | tornado |
What does a hurricane need to form? | low pressure, warm water, forms near equator, rotation of winds caused by Coriolis effect, wind going in the same direction as the storm |
Where do most hurricanes start? Why? | near the equator because of the warm water and stronger Coriolis forces |
three characteristics of an air mass that you need to know in order to classify it | temperature, pressure, and moisture |
type of weather system that brings calm, clear weather | high pressure |
symbol for low pressure | capital letter L that is red |
symbol for high pressure | capital letter H that is blue |