Starter: What is the difference between a cold front and a warm front? Explain how a front is...
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Starter: What is the difference between a cold front and a warm front? Explain how a front is different from an air mass 2/2/15 163 164 Severe Weather 2/2/15 Practice : Notes glue here when done Application: Severe Weather ws Connection: Why do hurricanes only occur in certain places? Where are thunderstorms most likely to occur? Exit: What are the characteristics of an air mass that form over the Gulf of Mexico? Explain how this air mass would affect us in Texas. Severe Weather
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Transcript of Starter: What is the difference between a cold front and a warm front? Explain how a front is...
Starter:What is the difference between a cold front and a warm front?Explain how a front is different from an air mass
2/2/15163 164 Severe Weather
2/2/15
Practice : Notes glue here when done
Application:Severe Weather ws
Connection: Why do hurricanes only
occur in certain places? Where are thunderstorms
most likely to occur?
Exit: What are the characteristics of an air mass that form over the Gulf of Mexico? Explain how this air mass would affect us in Texas.
Severe Weather
February 2, 2015AGENDA
8.10 A Recognize that the Sun provides the energy that drives convection within the atmosphere and oceans, producing winds and ocean currents. Supporting Standard
8. 10 C Identify the role of the oceans in the formation of weather systems such as hurricanes. Supporting Standard
1 Starter2. Notes3. Ws 4. Exit
Date Lecture/ Activity/ Lab Page
Table of Contents
1/26 Wind, Climate, and Ocean Currents 155-1561/27 Convection and Ocean Currents 157-158 1/28 Fronts and Air Masses 159-160 1/29 Pressure and Atmospheric Movement 161-1622/2 Severe Weather and Precipitation 163-164
Types of Precipitation/
The Whole Reason for WeatherThe sun is the
driving force behind the movement of moisture and weather.
The radiant energy from the sun transfers heat to the Earth and changes the water into solid, liquid and gas.
Moisture
☼ Evaporation is caused by heating water molecules until it turns into a gas.
Water molecules enter the air (atmosphere) through the process of evaporation
Ice forms as vapor
rises
Liquid forms as
vapor sinks
Humidity (GAS) the amount of water vapor or moisture in the air.
As air temperature increases, the amount of water the atmosphere can hold increases.
Rain (LIQUID)
Ice melts as it falls through warmer air.
Cloud droplets have little mass, so they may come together (condense) and become too heavy to stay in the cloud.
They then fall to Earth with the force of gravity.
Shape of rain drops
Frozen Precipitation
Forms when water vapor (gas) changes directly into a solid.
• Sleet begins as snow, a shallow layer of warm air partially melts then it refreezes into an ice-pellet.
Hail stones accumulate layers of ice as they move up and down within a cloud; eventually hailstones get too heavy and fall.
• Snow are ice crystals & comes in a variety of shapes depending on temperature.
Distribution of precipitation in the US
El Niño
El Niño is characterized by unusually warm temperatures on the sea surface in the Pacific Ocean at the equator.
This warming changes the flow patterns of the Trade winds and ocean currents and affects world-wide rainfall by causing flooding or droughts.
In the continental US, temperatures in the winter are warmer than normal in the North Central States, and cooler than normal in the Southeast and the Southwest.
La Niña
La Niña events follow the El Niño events and has the opposite effects on the ocean surface and weather patterns.
La Niña forms unusually cool temperatures in the Pacific ocean at the equator (shown in blue).
During a La Niña year, winter temperatures are warmer than normal in the Southeast (USA) and cooler than normal in the Northwest.
HurricaneA large, swirling, low-
pressure system that forms over tropical oceans with wind speeds up to 156 miles per hour.
Begin as a group of thunderstorms moving over tropical waters
Most powerful storms on Earth In the Pacific Ocean
called typhoons In the Indian Ocean
called cyclones
Thunderstorms Contain strong
winds, lightning, and thunder and heavy rain.
Happens when warm water evaporates, rises rapidly and then it cools, condenses and creates a Cumulonimbus cloud.
Warm and cold air move throughout the clouds swiftly; creating strong winds.
TornadoesViolent, spinning
column of wind that has high wind speeds and touches to the ground.
Usually starts out as a funnel cloud that pokes through the bottom of a cumulonimbus cloud (thunderstorm) and hangs in the air.
Called a tornado when it touches Earth’s surface.
LightningElectric discharge
that takes place between a positively and negatively charged area in a cloud
Can happen between two clouds or between the Earth and a cloud
Releases energy when it strikes
Thunder
The result of the energy from a lightning strike.
Energy is transferred to the air and causes air to expand in waves of sound.
Starter:What is the difference between a cold front and a warm front?Explain how a front is different from an air mass
2/2/15163 164 Severe Weather
2/2/15
Practice : Notes glue here when done
Application:Severe Weather ws
Connection: Why do hurricanes only
occur in certain places? Where are thunderstorms
most likely to occur?
Exit: What are the characteristics of an air mass that form over the Gulf of Mexico? Explain how this air mass would affect us in Texas.
Severe Weather
