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Earth Science
E.S. Chapter 20 Sections 1-3
| air mass | an immense body of air that is characterized by similar temperatures and amounts of moisture at any altitude |
| continental polar air masses | ___________ _______ ____ _______ are uniformly cold and dry in winter and cool and dry in summer. |
| maritime tropical air masses | ___________ ________ ____ _______ are warm, loaded with moisture, and usually unstable. |
| northwestern | In the winter, when New England is on the Northern or ______________ side of a passing-low-pressure enter, the counterclockwise winds draw in maritime polar air. |
| front | When two air masses meet, they form a ______, which is a boundary that separates two air masses of different properties |
| red; red | On a weather map, the surface position of a warm front is show by a ____ line with _____ semicircles that point toward the coolest air |
| blue; blue | On a weather map, the surface position of a cold front is shown by a ______ line edged with ______ triangles that point toward the warmer air mass. |
| stationary front | Sometimes, gentle to moderate precipitation occurs along a ____________ ______ |
| occluded front | When a cold front overtakes a warm front, an __________ _______ forms. |
| counterclockwise | The air in these weather systems moves in a ________________ direction and in toward the center of the low. |
| single- cumulonimbus | A thunderstorm may be produced by a _________-____________ cloud and influence only a small area or it may be associated with clusters of cumulonimbus clouds that stream for kilometers along a cold front. |
| 2000 thunderstorms | At any given time, there are an estimated ______ _____________ in progress on Earth |
| warm; humid | Thunderstorms form when ______, ______ air rises in an unstable environment |
| cumulus stage | strong updrafts, or upward movements of air, supply moist air |
| mature stage | Usually within an hour of the initial updraft, the _______ ______ begins. At this point in the development of the thunderstorm, the amount and size of the precipitation is too great for the updrafts to support. |
| dissipating stage | eventually, downdrafts, or downward movements of air, dominate throughout the cloud. |
| vortex | Tornadoes are violet windstorms that take the form of a rotating column of air |
| mesocyclone | A _____________ is a vertical cylinder of rotating air that develops, in the updraft of a thunderstorm. |
| 119 | Whirling tropical cyclones that produce sustained winds of at least ____ kilometers per hour |
| late summer | Hurricanes develop meet often in the ______ ________ when water temperatures are warm enough to provide the necessary heat and moisture to the air. |
| eye wall | The greatest wind speeds and heaviest rainfall occur in the _____ _____ |
| ceases; subsides | At the very center of the storm is the eye of a hurricane. This well-known feature is zone where precipitation _______ and __________ |
| storm surge | a dome of water about 65 to 80 kilometers wide that sweeps across the coast where a hurricane's eye onto land |
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VickieJ10
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