a large body of air that has the same temperature and humidity throughout classified according to where they originate as it moves, the characteristics.

Slides:



Advertisements
Similar presentations
Weather Maps & Fronts Refers to the state of the atmosphere at a specific time and place. Influenced by pressure systems (high and low) and fronts. Describes.
Advertisements

Chapter 20 Weather Patterns and Sever Storms
Storms  Unit 5 Earth Science.
Air Masses, Pressure Systems, and Frontal Boundaries
Prentice Hall EARTH SCIENCE
Atmosphere, Hydrosphere and Biosphere Interactions = STORMS!
These are the major types of severe weather that we will learn about today Thunderstorms Tornadoes Hurricanes.
Weather Part III Storms
Chapter 24 Section 2 Handout
Air Masses How do you think these air masses effect our weather?
Severe Weather.
AIR MASSES A large body of air (thousands of miles) Changes in weather are caused by movements of air masses As an air mass moves away, temp & humidity.
Air Masses and Weather Fronts
Weather.
Earth’s Weather and Climate
FRONTS Fronts When 2 air masses meet density differences keep them separate Front- boundary between air masses 100’s to 1,000’s of miles wide.
Weather Patterns and Severe Storms Chapter 20
An immense body of air that is characterized by similar temperatures & amts. of moisture at any altitude As air masses move the characteristics of an.
Develop and use models to explain how relationships between the movement and interactions of air masses, high and low pressure systems, and frontal boundaries.
Storms and Weather Forecasts
Section 17.1 Notes Weather changes as air masses move.
Objectives: Identify two types of pressure systems. Identify two types of pressure systems. Identify and describe what causes weather patterns. Identify.
Chapter 20.1 Air Masses and Weather. While You Read 20.1 What is an air mass and how does it typically gain its specific characteristics? An air mass.
Weather Chapter 24.
16.2 Weather Patterns. Air Mass A large body of air that contains properties similar to the part of the Earth’s surface where it developed.  Air masses.
Chapter 20: Weather.  a body of air in the lower troposphere that has similar characteristics  temperature & humidity depends on where they form  named.
a large body of air that has the same temperature and humidity throughout classified according to where they originate during the time the air mass.
Air Masses and Fronts Air masses are classified according to temperature and humidity 4 major types of air masses: Maritime tropical: form over the ocean.
What factors affect our weather? Heat in our atmosphere Winds Water cycle.
Chapter 20.3 Severe Storms.
Weather Patterns (57) An air mass is a large body of air that has properties similar to the part of Earth’s surface over which it develops. Six major air.
Section 2: Fronts Preview Objectives Fronts
Weather Patterns Air Mass: A large body of air that has properties similar to the part of Earth’s surface over which it develops. Air masses cover thousands.
a large body of air that has the same temperature and humidity throughout classified according to where they originate during the time the air mass.
Air Masses and Weather 17 Air Masses  Air Masses An air mass is an immense body of air that is characterized by similar temperatures and amounts of moisture.
STORMS COULTER. THUNDERSTORMS STORM IS CLASSIFIED AS A VIOLENT DISTURBANCE IN THE ATMOSPHERE. THUNDERSTORM IS A SMALL STORM OFTEN ACCOMPANIED BY HEAVY.
a large body of air that has the same temperature and humidity throughout classified according to where they originate during the time the air mass.
UNIT 1: Weather Dynamics Chapter 1: Inquiring about Weather The Causes of Weather Chapter 2: Weather Forecasting.
Weather Patterns. Weather Changes Because of the movement of air and moisture in the atmosphere weather constantly changes.
CHAPTER 20.1 Air Masses.  Severe storms can be one of nature’s most destructive forces.  During spring time there are tornadoes, which or short, violent.
IN p 133 Explain the difference between the vocabulary words in each of the following sets: 1.air mass, front 2.Humidity, relative humidity 3.Relative.
Storms and the Movement of Air Textbook pages
Chapter 24 Weather The state of the atmosphere at any given time or place. Differences in air pressure are caused by unequal heating of Earth’s surface.
An air mass is a large body of air that has properties similar to the part of Earth’s surface over which it develops. Weather Changes—Air Masses Six major.
 A usually brief, heavy storm that consists of rain, strong wind, lightning, and thunder.
Weather. Making Weather Forecasts  Weather Measurements are Made  Measurements are Put Into Weather Forecast Models  The Models are Interpreted.
Chapter 20: Weather Air Masses & Fronts.
Meteorology.
Weather and Climate.
EASC 11 Forecasting, Weather Maps, and Severe Storms Forecasting
Chapter 20 Air Masses.
Weather.
Section 2 and 3 Weather Patterns
20 Weather 20.1 Air Masses and Weather 20.2 Fronts and Lows
Forecasting Weather.
Fronts, Symbols, and Weather
Weather Patterns and Severe Storms
Air Masses and Severe Storms
Section 2: Fronts Preview Key Ideas Fronts Types of Fronts
Severe Weather.
Weather Patterns & Severe Storms
Chapter 20.1 Air Masses and Weather.
Weather The present state in the atmosphere at a given location for a short period of time.
Does Weather Control Your Life???
Weather Patterns and Severe Storms
*.
Air Masses and Severe Weather
Movement and Interaction of Air
Air Masses and Severe Weather
Weather patterns and severe storms
Presentation transcript:

a large body of air that has the same temperature and humidity throughout classified according to where they originate as it moves, the characteristics of an air mass change and so does the weather in the area over which the air mass moves.

Air Masses Are Classified by Region

Originates over the ocean  humid air mass (m) (maritime)

Originates over the land  dry air mass (c) (continental)

Originates in cold air  cool air mass (P) (Polar)

Originates in warm air  warm air mass (T) (Tropical)

Maritime Tropical Atlantic (mT) moves northward across eastern US brings mild, cloudy winters and hot humid summers with hurricanes and thunderstorms

View satellite movies of air masses moving across North America.

small balloon carried observatory that carries a radio transmitter that sends out signals about air pressure, temperature, and humidity

fronts: boundary between two air masses having different temperatures and humidity

forms when warm air moves into an area formerly covered by cooler air brings hot, humid days and precipitation over a large area

forms when cold, dense air moves into a region occupied by warmer air brings strong storms (squall) with clear days following

Compare and contrast warm and cold fronts.

two cold masses sandwich a warm mass brings strong winds and heavy rains

the flow of air on either side of the front is neither toward the cold air mass nor toward the warm air mass, but almost parallel to the line of the front- the surface position of the front does not move

small-area storms formed by the strong upward movement of warm, moist, unstable air always accompanied by lightning, thunder, rain and sometimes hail formed from cumulonimbus clouds

Observe an animation of a thunderstorm.

Air-mass thunderstorm: form in warm, moist air mass occur in spring and summer- last less than 1 hour single, widely scattered

Frontal thunderstorm: occur in lines along a frontal surface stronger and may last several hours can produce heavy rain and flooding

Lightning: a discharge of electricity from a thundercloud to the ground, or cloud to cloud, or ground to cloud

temperature inside lightning flash can reach 28,000°C at this temperature, air expands explosively-sudden expansion makes thunder!

a narrow, funnel-shaped column of spiral winds that extends downward from the cloud base and touches the ground

strongest winds between 360 and 500 km/hr funnel less than 500 m across always travel with a parent thunderstorm at speeds ranging from 40 to 65 km/hr

funnel is a mixture of clouds and dust pressure gets lower in center air flows toward the funnel and cools to dew point- drops form lowering of condensation level due to low pressure causes cloud to funnel Extremely low pressure-when it touches ground, acts like a giant vacuum

Waterspout: tornados over the water- weaker than tornados

Tornados usually occur during spring and summer and most likely occur in late afternoon

Fujita Scale: scale used for categorizing tornados

an intense tropical low- pressure area with sustained winds starting at 75 mph

storm surge: currents formed when hurricanes pile water up along the shore and blow it inland most damaging part of a hurricane

eye: central area of sinking air; 15 to 20 km wide

Eye of hurricane Floyd

Winds most violent just outside the eye

Aug. 28, 2005: Katrina's eyewall was seen from a hurricane-hunter plane. Photo: NOAANOAA

hurricanes/inside/elements.html Check out this website!

Tropical depression: wind speeds up to 38 mph; some circular rotation at surface

Tropical storm: wind speeds from mph; can be named, shows drop in pressure, distinct rotation

Hurricane: wind speeds up to 75 mph

Movement of Air in a Hurricane

There are sometimes gaps in between these bands where no rain is found. In fact, if one were to travel between the outer edge of the hurricane to its center, one would normally progress from light rain to dry back to slightly more intense rain again over and over with each period of rainfall being more intense and lasting longer until reaching the eye. Upon exiting the eye and moving towards the edge of the hurricane, one would see the same events as they did going in, but in opposite order.

A schematic of this banding feature can be seen in the diagram above. The thunderstorms are now organized into regions of rising and sinking air. Most of the air is rising, but there is a small amount found in between the thunderstorms that is sinking.

Satellite image of Hurricane Katrina on Aug. 28, 2005, when the storm was a Category Five hurricane. Hurricanes don't get much stronger than this. Photo: NOAANOAA

The coasts of Louisiana, Mississippi, Alabama and part of Florida, seen from space on October 15, Original photo from NASA NASA

A gigantic, dangerous storm, Hurricane Katrina takes aim at New Orleans and the Mississippi coast. Photo: NASANASA

Meteorologists interpret weather information from: satellites commercial aircraft weather balloons

Eastern U.S.-Infrared Satellite 11:45 am 9/14/05 Ophelia

Eastern U.S.- Visible Satellite

weather stations around the world Radar: electronic device that transmits radio waves in the form of a beam

Data is collected and put into a central computer at the National Weather Service data includes: winds, temperature, pressure, humidity, clouds, precipitation Makes a computer model (copy of the atmosphere in computer

Maps are made and forecasts are reported to local stations across the country Weather forecasts are issued by the Weather Service at 10 am, 4 pm, 9pm, and 4 am. Forecasts are updated more often during severe weather.

Interactive Weather Page

watch: threat of storm conditions within hours warning: due to strike within 24 hours