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40 Cards in this Set
- Front
- Back
isobars
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a contour line of equal or constant pressure on a graph, plot, or map.
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milibar
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A unit of atmospheric pressure equal to one thousandth (10 -3) of a bar. Standard atmospheric pressure at sea level is about 1,013 millibars.
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weather system
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The state of the atmosphere at a given time and place, with respect to variables such as temperature, moisture, wind velocity, and barometric pressure.
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high pressure system
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aka an anticyclone
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anticyclone
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aka the high pressure system
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low pressure system
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aka a cyclone
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cyclone
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akathe low pressure system
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mighty masses
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aka air mass a large quantity of air sharing the same characteristics
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continental polar
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(abb) cP air mass comes from northern canada
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maritime polar
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(abb) mP also means from the ocean. comes from thr north of atlantic or north pacific,
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continental tropical
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(abb) cT from mexico
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maritime tropical
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(abb) mT from the gulf of mexico, the tropical atlantic, or the tropical pacific
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clod front
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cold air advancing
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warm front
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warm air advancing
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stationary front
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none advancing
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occluded front
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if a cold front overtakes a warm front
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frontal low
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a low originating along a frontal line
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cumuloninbus cloud
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aka thunderhead
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squall lines
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the long lines of a thunderstorms that may form in the warm air ahead of a moving cold front
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updraft
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a strong upward air current ascending at speeds that may exceed 100 mph
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downdrafts
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strong downward air currents
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step leaders
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downward, negatively charged channels
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streamer
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an upward, positively charged return stroke
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waterspout
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a tornado forming over a body of water *danger danger* do not go near any twister, funnel or waterspout *deadly dangerous*
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supercell
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an unusually large cumulonimbus
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wallcloud
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a rotating mass of cloud
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trade wind inversion
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beginning at a certain altitude above the trade-wind zones, air temperatuer rises with altitude, producing a layer of air
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tropical depression
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a baby hurricane
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tropical storm
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a storm with winds going at 39 mph
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tropical cyclone
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wind speed at 75 mph aka a typhoon in the pacific ocean, a willy-willy in australia, and a hurricane in america and the west indies
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five most important properties of air
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1:temperature,2:pressure,3:humidity,4:wind direction,5:wind speed
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meteorologists
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scientists who study the weather
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thermometer
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An instrument for measuring temperature
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thermograph
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records the temperature it indicates
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barometer
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An instrument for measuring atmospheric pressure, used especially in weather forecasting
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standard pressure
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the average air pressure at sea level
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hygrometer
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Any of several instruments that measure atmospheric humidity
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psychrometer
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An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air
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wet-bulb depression
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The difference in degrees between the dry-bulb temperature and the wet-bulb temperature.
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hygrograph
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An automatic hygrometer that records variations in atmospheric humidity
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