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6th Grade Ch 12

Weather factors, Precipitation, Clouds, Fronts, Severe Weather

The 4 main types of precipitation rain, snow, sleet, hail
______________ variations within clouds and/or within the region between the cloud and Earth determines the various forms of precipitation temperature
Clouds form as a result of _________ condensation
Clouds that form from the condensation of water vapor are classified by a ________ and __________ shape & height
The 3 major classifications of clouds cumulus, cirrus, and stratus
_________ clouds are formed at medium to low elevations, and are puffy with flat bottoms. cumulus
Cumulus clouds that are white signal _____ weather, but when they are darker in color, they may signal ________. fair, rain
________ clouds are formed at high elevations, are wispy, and consist of ice crystals. cirrus
Cirrus clouds usually signal _________ weather or an approaching _______ front. fair, warm
________ clouds form at medium or low elevation, are layered and cover a large area. stratus
Stratus clouds usually bring long periods of steady ______________. precipitation
Nimbus means _______ ___________ cloud. rain bearing
The prefix alto refers to clouds at __________ elevation. medium
Fog is an example of a ________ cloud that forms near the ground. stratus
_____ forms when drops of water fall in temperatures above freezing. rain
_____ forms when the air temperature is so cold that water vapor changes directly to a solid. snow
_____ forms when raindrops pass through a layer of freezing air near Earth's surface. sleet
_____ forms in cumulonimbus clouds when water freezes in layers as the ice nucleus is tossed up and down within the cloud. hail
The 3 things that determine various weather conditions air masses, fronts, and pressure systems
____ _________ are huge bodies of air that form over water or land in tropical or polar regions. air masses
_____ ________ can form with cool/moist air, cold/dry air, warm/moist air, or hot/dry air based on where they form. air masses
_____ form at the boundaries between air masses. Fronts
The 4 types of fronts warm, cold, stationary, and occluded
When a warm air mass collides and rides over a cold air mass, the resulting _____ front may produce long periods of precipitation and warmer temperatures. warm
When a cold air mass collides and slides under a warm air mass, the resulting _____ front may produce thunderstorms and sometimes tornadoes and cooler temperatures. cold
When neither a cold air mass nor a warm air mass moves at a frontal boundary, the resulting ________ front may produce long period of precipitation. stationary
When a cold air mass pushes into a warm air mass that is behind a cool air mass, the warm air mass is pushed up above the cooler air masses. The resulting ______ front may produce long periods of precipitation. occluded
______ _________ systems usually signal more fair weather with winds circulating around the system in a clockwise direction. High pressure
______ _________ systems with counterclockwise circulating winds often result in rainy and/or stormy weather conditions. Low pressure
Severe weather conditions called _______ occur when pressure differences cause rapid air movement. storms
A storm with heavy rains and strong winds that form within cumulonimbus clouds along a cold front or within an air mass. Thunderstorm
A very low pressure system with a rapidly whirling, funnel shaped cloud that extends down from a storm cloud. Tornado
A low pressure tropical storm that forms over warm ocean water with winds that form a spinning circular pattern around the center, or eye, of the storm. Hurricane
A tool used to measure wind speed in miles per hour. anemometer
A tool used to measure wind direction. wind vane
A tool used to measure air temperature in degrees Fahrenheit or Celsius. thermometer
A two-thermometer instrument also referred to as a wet-dry bulb used to measure relative humidity. psychrometer
The amount of water vapor in the air compared to the amount needed for saturation at a specific temperature. relative humidity
A tool used to measure air pressure in inches of mercury or millibars(mb). barometer
A tool used for measuring the amount of precipitation in inches or centimeters. rain gauge
_________ _____ can help predict weather patterns by indicating high or low pressure systems (isobars), movement of air masses and fronts, or temperature ranges (isotherms). Weather maps
_______ _________ provide information from specific locations that can also be used to predict weather patterns. station models
Created by: Ms. Phillips