What is an Air Mass Air masses are
![What is an Air Mass? § Air masses are large bodies of air which What is an Air Mass? § Air masses are large bodies of air which](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-1.jpg)
![Air Masses § An air mass that forms over a cold portion of the Air Masses § An air mass that forms over a cold portion of the](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-2.jpg)
![SOURCE REGIONS - WHERE AIR MASSES ACQUIRE THEIR PROPERTIES Air Masses are Classified According SOURCE REGIONS - WHERE AIR MASSES ACQUIRE THEIR PROPERTIES Air Masses are Classified According](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-3.jpg)
![§ § c. T c. P m. T m. P Continental Tropical – dry § § c. T c. P m. T m. P Continental Tropical – dry](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-4.jpg)
![NORTH AMERICAN AIR MASS SOURCE REGIONS NORTH AMERICAN AIR MASS SOURCE REGIONS](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-5.jpg)
![](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-6.jpg)
![§ The general movement of the four main types of air masses that influence § The general movement of the four main types of air masses that influence](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-7.jpg)
![§ Storm tracks across the continental United States From West to East. This makes § Storm tracks across the continental United States From West to East. This makes](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-8.jpg)
![FRONTS § Fronts are boundaries that separate air masses § There are four types FRONTS § Fronts are boundaries that separate air masses § There are four types](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-9.jpg)
![Go to page 13 of your ESRT! Go to page 13 of your ESRT!](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-10.jpg)
![Fronts – boundary that separates 2 different air masses § Either a warm front Fronts – boundary that separates 2 different air masses § Either a warm front](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-11.jpg)
![COLD FRONT § § § Cold air replaces warm Much steeper than warm fronts COLD FRONT § § § Cold air replaces warm Much steeper than warm fronts](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-12.jpg)
![Cold Front § A cold front occurs when a more dense air mass pushes Cold Front § A cold front occurs when a more dense air mass pushes](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-13.jpg)
![WARM FRONT § § § Warm air replaces cold Gentle slope Covers a wide WARM FRONT § § § Warm air replaces cold Gentle slope Covers a wide](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-14.jpg)
![Warm Front § A warm front occurs when a less dense air mass rides Warm Front § A warm front occurs when a less dense air mass rides](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-15.jpg)
![STATIONARY FRONTS § Cold and warm air masses next to each other § Neither STATIONARY FRONTS § Cold and warm air masses next to each other § Neither](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-16.jpg)
![Stationary Front § A stationary front occurs when the air masses on either side Stationary Front § A stationary front occurs when the air masses on either side](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-17.jpg)
![OCCLUDED FRONTS § § § Cold front overtakes the cool front Lifts the warm OCCLUDED FRONTS § § § Cold front overtakes the cool front Lifts the warm](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-18.jpg)
![Occluded Front Occluded Front](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-19.jpg)
![Air rising and cooling to the dew point by expansion (adiabatic cooling) By forced Air rising and cooling to the dew point by expansion (adiabatic cooling) By forced](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-20.jpg)
![Kinds of Fronts § § Cold Fronts Warm Fronts Stationary Fronts Occluded Fronts Kinds of Fronts § § Cold Fronts Warm Fronts Stationary Fronts Occluded Fronts](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-21.jpg)
![A continental polar air mass comes down from Canada and meets a maritime tropical A continental polar air mass comes down from Canada and meets a maritime tropical](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-22.jpg)
![Air rising and cooling to the dew point by expansion (adiabatic cooling) By convection: Air rising and cooling to the dew point by expansion (adiabatic cooling) By convection:](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-23.jpg)
![Air will rise when it is heated, because it will become less dense. Air Air will rise when it is heated, because it will become less dense. Air](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-24.jpg)
- Slides: 24
![What is an Air Mass Air masses are large bodies of air which What is an Air Mass? § Air masses are large bodies of air which](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-1.jpg)
What is an Air Mass? § Air masses are large bodies of air which have similar temperature and moisture characteristics. § Air masses form when air stays over a region (called the source region) for several days. § Air masses that form over water will be moist, called MARITIME air masses § Air masses that form over land will be dry, called CONTINENTAL air masses
![Air Masses An air mass that forms over a cold portion of the Air Masses § An air mass that forms over a cold portion of the](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-2.jpg)
Air Masses § An air mass that forms over a cold portion of the Earth is called a POLAR air mass. § An air mass that forms over a warm portion of the Earth is called a TROPICAL air mass. § An air mass that forms over an extraordinarily cold portion of the Earth is called an ARCTIC air mass.
![SOURCE REGIONS WHERE AIR MASSES ACQUIRE THEIR PROPERTIES Air Masses are Classified According SOURCE REGIONS - WHERE AIR MASSES ACQUIRE THEIR PROPERTIES Air Masses are Classified According](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-3.jpg)
SOURCE REGIONS - WHERE AIR MASSES ACQUIRE THEIR PROPERTIES Air Masses are Classified According to: Surface of source region Continental (c) Forms over land - dry Maritime (m) Forms over ocean - moist Temperatures Tropical (T) -Low latitudes - warm Polar (P) - High latitudes - cold Arctic (A) - Poles - very cold and dry
![c T c P m T m P Continental Tropical dry § § c. T c. P m. T m. P Continental Tropical – dry](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-4.jpg)
§ § c. T c. P m. T m. P Continental Tropical – dry & warm Continental Polar – dry & cold Maritime Tropical – humid & warm Maritime Polar – humid & cold § c. A Continental Arctic – very dry & very cold
![NORTH AMERICAN AIR MASS SOURCE REGIONS NORTH AMERICAN AIR MASS SOURCE REGIONS](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-5.jpg)
NORTH AMERICAN AIR MASS SOURCE REGIONS
![](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-6.jpg)
![The general movement of the four main types of air masses that influence § The general movement of the four main types of air masses that influence](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-7.jpg)
§ The general movement of the four main types of air masses that influence the weather over the United States. The tropical air masses visit most often in the summer, and the polar air masses visit most often during the winter. During other times, the polar and tropical air masses battle back and forth over the land.
![Storm tracks across the continental United States From West to East This makes § Storm tracks across the continental United States From West to East. This makes](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-8.jpg)
§ Storm tracks across the continental United States From West to East. This makes it possible to predict What weather is coming our way.
![FRONTS Fronts are boundaries that separate air masses There are four types FRONTS § Fronts are boundaries that separate air masses § There are four types](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-9.jpg)
FRONTS § Fronts are boundaries that separate air masses § There are four types of front: – Stationary front – Cold front – Warm front – Occluded front
![Go to page 13 of your ESRT Go to page 13 of your ESRT!](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-10.jpg)
Go to page 13 of your ESRT!
![Fronts boundary that separates 2 different air masses Either a warm front Fronts – boundary that separates 2 different air masses § Either a warm front](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-11.jpg)
Fronts – boundary that separates 2 different air masses § Either a warm front is advancing or a cold front is advancing.
![COLD FRONT Cold air replaces warm Much steeper than warm fronts COLD FRONT § § § Cold air replaces warm Much steeper than warm fronts](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-12.jpg)
COLD FRONT § § § Cold air replaces warm Much steeper than warm fronts Advances faster than warm front More violent weather -cumulonimbus clouds Short, sharp showers
![Cold Front A cold front occurs when a more dense air mass pushes Cold Front § A cold front occurs when a more dense air mass pushes](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-13.jpg)
Cold Front § A cold front occurs when a more dense air mass pushes under a less dense air mass – short– lived thunderstorms
![WARM FRONT Warm air replaces cold Gentle slope Covers a wide WARM FRONT § § § Warm air replaces cold Gentle slope Covers a wide](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-14.jpg)
WARM FRONT § § § Warm air replaces cold Gentle slope Covers a wide area with its weather Stratus clouds get lower as front approaches Drizzle or steady rain
![Warm Front A warm front occurs when a less dense air mass rides Warm Front § A warm front occurs when a less dense air mass rides](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-15.jpg)
Warm Front § A warm front occurs when a less dense air mass rides up over a more dense air mass – longer, steady precipitation
![STATIONARY FRONTS Cold and warm air masses next to each other Neither STATIONARY FRONTS § Cold and warm air masses next to each other § Neither](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-16.jpg)
STATIONARY FRONTS § Cold and warm air masses next to each other § Neither air mass advances
![Stationary Front A stationary front occurs when the air masses on either side Stationary Front § A stationary front occurs when the air masses on either side](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-17.jpg)
Stationary Front § A stationary front occurs when the air masses on either side of the front are not moving toward each other.
![OCCLUDED FRONTS Cold front overtakes the cool front Lifts the warm OCCLUDED FRONTS § § § Cold front overtakes the cool front Lifts the warm](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-18.jpg)
OCCLUDED FRONTS § § § Cold front overtakes the cool front Lifts the warm air off the ground Clouds and rain possible
![Occluded Front Occluded Front](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-19.jpg)
Occluded Front
![Air rising and cooling to the dew point by expansion adiabatic cooling By forced Air rising and cooling to the dew point by expansion (adiabatic cooling) By forced](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-20.jpg)
Air rising and cooling to the dew point by expansion (adiabatic cooling) By forced lifting—such as when less dense warm air is forced above more dense cold air (when two air masses meet)
![Kinds of Fronts Cold Fronts Warm Fronts Stationary Fronts Occluded Fronts Kinds of Fronts § § Cold Fronts Warm Fronts Stationary Fronts Occluded Fronts](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-21.jpg)
Kinds of Fronts § § Cold Fronts Warm Fronts Stationary Fronts Occluded Fronts
![A continental polar air mass comes down from Canada and meets a maritime tropical A continental polar air mass comes down from Canada and meets a maritime tropical](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-22.jpg)
A continental polar air mass comes down from Canada and meets a maritime tropical air mass from the Gulf of Mexico. Watch the cloulds form.
![Air rising and cooling to the dew point by expansion adiabatic cooling By convection Air rising and cooling to the dew point by expansion (adiabatic cooling) By convection:](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-23.jpg)
Air rising and cooling to the dew point by expansion (adiabatic cooling) By convection: The Sun heating the ground (by radiation), which then heats the air above (by conduction), which then rises due to convection (is less dense than the cooler air surrounding it. ) Picture from the National Audubon Society Field Guide to Weather
![Air will rise when it is heated because it will become less dense Air Air will rise when it is heated, because it will become less dense. Air](https://slidetodoc.com/presentation_image/500024bc8b1e1b6d28fa2248ed492f53/image-24.jpg)
Air will rise when it is heated, because it will become less dense. Air moves in to replace the air that rose up. The converging air will further rise. As it rises, it cools and water vapor will condense. This will release latent heat, and further heat the column of air.
Cold front air movement
Air masses & frontswhat is an air mass?
Air masses & frontswhat is an air mass?
Stationary front
The boundary between two adjacent air masses is called
Two cold air masses converge on a warm air mass
Air masses & frontswhat is an air mass?
Insidan region jh
Cold air mass overtakes warm air mass
A swirling center of low air pressure is called
Air masses
What are the five types of air masses?
Air masses and their characteristics
How to draw cold front
Air masses
Warm hall
Continental arctic air mass symbol
Air masses form in the tropics and have low pressure
Air masses
Area of low pressure where air masses meet and rise
What letters designate an air mass from the gulf of mexico?
Large scale rotating air mass
What are middle-latitude cyclones?
Air fronts
Air mass mt