http://www.phschool.com/atschool/phsciexp/active _art/weather_fronts/ Chapter Three Notes http://www.phschool.com/atschool/phsciexp/active _art/weather_fronts/

Air masses Large volume of air in which temperature and humidity are the same in different areas but not at the same altitude Takes on the same characteristics as the area it is in. If it is cold then the mass is cold, if it is wet the mass becomes moist and so on.

Scale for learning - Weather 4 – I am an expert I can explain, in detail, the structure and how the atmosphere supports life and influences weather and climate 3 – I can do it I can explain the structure and how the atmosphere supports life and influences weather and climate 2 – I am almost there I can explain the structure of the atmosphere but I am still unclear about how it supports life and influences the weather and climate 1 – I need help With help, I can explain the structure of the atmosphere and how it supports life and influenced the weather and climate.

Fronts - Warm Fronts: -Move Slowly. -Warm air moves over dense cold air, -High cirrus and stratus clouds. -Hours of rain or snow fall Stationary Fronts: -The cold and warm fronts and don’t move. It may remain this way for a few days, and cause clouds coverage. Eventually it will become one of the other fronts. Fronts: A boundary between air masses There are three types of fronts Cold Fronts: -Move Quickly. -Cold air push against warm air, causing the warm air to rise. -Cumulus clouds -Heavy storms -After the storm weather is clear and cool

Pressure Systems and Weather High Pressure: Large Air is sinking and moving clockwise Clear Skies, calm air, gentle breeze Low Pressure: Air circles counter-clockwise and moves upward Air moves faster as it moves up, this can cause stormy weather

Formation of Storms Low Pressure Systems Can Become Storms: -Tropical storms are low pressure storms that form near the equator. Winds of 65 kph -Hurricane low pressure storms with winds of 120kph. Can uproot trees. Formation and Effects Of Hurricanes: -Strike between August and October -It grows over warm water, Dies out when water gets cold or moves over land -Eye of the storm is clear, Just around the eye are large cumulus clouds -Cause tornadoes, heavy rains, damage, flooding, storm surges (huge walls of water) -There is time to plan and evacuate

Winter Weather Winter Storms: - Winter storms happen when two storms collide - Can be warned 48 hours prior to a storm Blizzards: - Blinding snow storm with winds of 56kph and low temperatures. Can knock down trees and power lines, pipes can freeze, facilities may be closed Ice Storms Freezing rain Covers everything with heavy and smooth ice Hard to drive, things break with the weight of the ice, can shut down entire cities

Chapter review Chapter 3.1 Answer questions 3, 4, 5 and 6. Create diagrams that represents a cold front, warm front and low pressure system. Briefly label them with the type of weather they produce. Chapter 3.2 Answer questions 1, 3, and 5 Chapter 3.3 Answer questions 1, 2, 3, 4, and 5