|
What is the Southern Oscillation? |
the intermittent switch from El Niño to La Niña conditions in the equatorial Pacific |
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A sea breeze usually originates during the ________. |
day and flows toward the land |
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In the Northern Hemisphere, the winds associated with a low pressure system (cyclone) blow ________. |
counterclockwise and toward the center |
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Low air pressure systems are usually associated with ________. |
converging air, precipitation, and high pressure aloft |
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Most of the United States is situated in which zone of prevailing winds? |
westerlies |
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Fast moving currents of air found near the top of the troposphere are called ________. |
jet streams |
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This pressure zone is associated with abundant precipitation and warm temperatures. |
equatorial low |
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You are watching the local weatherman on TV. You live in mid-latitudes in North America, and the weatherman says that winds high in the atmosphere are blowing toward the northwest. Is this normal? |
No, Northern Hemisphere winds aloft always move from west to east because of the Coriolis force. |
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In the Northern Hemisphere, winds associated with a high pressure system blow ________. |
clockwise and outward from the center |
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When someone says we have a southeast wind, what direction would you look to face into the wind? |
Southeast |
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The Sahara and Australian deserts (among others) are associated with the ________. |
subtropical high |
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If stormy weather were approaching, the pressure tendency would probably be ________. |
Falling |
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Low pressure systems are usually associated with clear weather. |
False |
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Upper air winds ________. |
are generally faster than surface winds |
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In the Northern Hemisphere, winds blow clockwise and outward from the center of anticyclones. |
True |
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If the barometer indicated 1020 millibars, air pressure would be considered high. |
True |
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When are upper air winds fastest? |
In Winter |
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Standard sea level pressure in inches of mercury is ________. |
29.92 inches |
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Closely spaced isobars indicate high wind speeds. |
True |
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The force that generates wind is ________. |
pressure gradient force |
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The Coriolis effect is strongest at the equator and diminishes in strength poleward. |
False |
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A land breeze usually originates during the ________. |
evening and flows toward the water |
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The ultimate cause of a sea breeze is the unequal heating of land and water. |
True |
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What is the technical name for a high pressure center? |
anticyclone |
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The Coriolis effect influences wind speed but not wind direction. |
False |
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Which of these factors influence the magnitude of the Coriolis Effect? |
both wind speed and latitude |
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Cyclones are usually associated with stormy weather. |
True |
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Surface high pressure systems are usually associated with ________. |
all of these |
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An isobar is a line connecting places of equal humidity. |
False |
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Anticyclones characteristically have winds blowing out from their centers. |
True |
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High pressure systems are usually associated with stormy weather. |
False |
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If "fair" weather were approaching, the pressure tendency would probably be ________. |
rising |
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A southwest wind blows toward the northeast. |
True |
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Which of these instruments is NOT used to measure air pressure? |
anemometer |
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