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27 Cards in this Set
- Front
- Back
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any large body of lower atmosphere having fairly uniform conditions of temperature and moisture
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Air Mass
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Air masses that originate in the lower latitudes
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Tropical Air Mass
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Air masses that originate in the higher latitudes
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Polar Air Mass
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Air masses that originate deep within continents
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Continental Air Masses
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Air masses that originate over Oceans
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Marine Air Masses
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Continental Air masses tend to be ____________ than marine air masses
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Drier
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force exerted on a square centimeter of the earth's surface by the column of air directly above it
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Atmospheric Pressure
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Air pressure is measured in ________
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Millibars (mb)
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Centers of areas of high or low pressure
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Pressure Systems
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Occur when upper atmospheric air is moving downward
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High Pressure
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Occur when air at or near the earth's surface rises
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Low Pressure
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Anticyclone is associated with a ________ __________ system
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High Pressure
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Cyclone is associated with a ________ _______ system
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Low Pressure
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In the northern hemisphere, this type of pressure system produces clockwise air movement out from the center of the system
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High Pressure (Anticyclone)
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In the northern hemisphere, this type of pressure system produces wind in a counterclockwise direction moving into the system's center
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Low Pressure (Cyclone)
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When two air masses of different temperature and moisture characteristics come in contact with each other, the result is a
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Front
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When air masses meet, the less dense warm air is forced up over the denser cold air, causing ____________ ___________-
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frontal precipitation
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Contact between a cold air mass and a warm air mass when the cold air mass advances on the warm air mass and drives the warm air mass upward is a
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Cold Front
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Contact between a warm air mass and a cold air mass where the warm air is moving against the cold air and is sliding upward along the contact is a
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Warm Front
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Condition in a mid-latitude cyclone when the cold and warm fronts have merged. Result is a pocket of warmer air above cold air at the surface
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Occluded Front
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Warm and cold fronts are usually associated with _______ pressure cells, and they rotate in a CCW direction
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Low
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Study of short term changes and events in the atmosphere constitutes the field of
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meteorology
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If the first digit of the barometric reading is a 5 or higher, you _____________ _ _________ before it
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9
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If the reading is less than 5, you need to ________ _ _____________ before it.
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10
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Weather station Pressure is 342, you would interpret it as
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1034.2
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If the weather station pressure is 786, you would interpret it as
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978.6
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A decimal must be added before the last number, when reading change in barometric pressure. If the change in barometric has been 21, then it would be read as _____________. If the change is -3 then it would be read as __________.
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+2.1;-0.3
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