Chapter 5 Weather – Study Questions When water droplets in a cloud combine, become too heavy, and fall to the ground as rain, snow, sleet, or hail, we are experiencing ____. Masses of puffy, white clouds, often with flat bases, that form when air currents rise are called ____ clouds. ____ forms when raindrops pass through a layer of freezing air near Earth's surface, forming ice pellets. ____ forms when the air temperature is below freezing and water vapor changes directly to solid. To keep track of high-and lowpressure areas, weather maps are drawn with lines connecting points of equal atmospheric pressure. These lines are called ____. Weather expected? Clouds form as warm air rises, expands, cools, and becomes saturated, and then ____ condense(s) into tiny drops, which collect. ____ humidity is a measure of the amount of water vapor that air is holding compared to the amount needed for saturation at a specific temperature. Tornadoes can form when wind at different ____ blows in different directions and at different speeds. A(n) ____ connects points of equal temperature. #1 - type of air mass? Low, layered gray clouds that produce light precipitation are ____ clouds. Violent storms generally form along ____. A(n) ____ shows weather conditions at one specific location. Fog is a ____ cloud that forms near the ground. ____ can be produced by thunderstorms. High, thin, white, feathery clouds containing ice crystals are usually associated with fair weather, but they can also indicate approaching storms. These clouds are called ____ clouds. areas of less dense, warm air that can be forced upward #2 - type of air mass? Areas of low-pressure usually have ____. The interaction of air, water, and ____ causes weather. A violent, whirling wind that moves in a narrow path over land is a ____. #2 - type of air mass? High pressure means good weather because ____. a type of precipitation that forms when the air temperature is below freezing and water vapor changes directly to a solid When severe weather conditions already exist, a(n) ____ is issued. 2 clouds formed a form of precipitation that can break windows and destroy crops The boundary between cold and warm air masses is called a ____. Weather expected? the temperature at which air is saturated and condensation forms areas of descending air Most hurricanes ____. A ____ studies and forecasts the weather using data gathered from many sources. stratus cloud that forms when air condenses near the ground forms when millions of water droplets become suspended in air and collect around small dust particles given as a percentage indicating how much water vapor is in the air on a certain day #1 - type of air mass? The temperature at which air is saturated and condensation forms is the ____. a type of precipitation that forms when raindrops pass through a layer of freezing air near Earth's surface When air contains as much moisture as possible at a specific temperature, it is ____. 2 clouds formed As the temperature of air increases, can it hold more water vapor (A) or less water vapor (B)? Water can form on grass in the early morning when the air is clear because ____. What kind of front is shown? Precipitation and storms occur ____. What is the name for the amount of water vapor held in air? A(n) ____ is a large body of air that has the same properties as the Earth's surface over which it develops. What drives the weather? How does atmospheric pressure affect the weather? What kind of front is shown?