Transcript weather front

Warm-Up
February 19
What is the composition of the atmosphere?
78% Nitrogen
21% Oxygen
1% CO2, water vapor, neon, hydrogen,
and other gases
Earth Science Rocks
• MYP Unit Question: What should I wear today?
• Area of Interaction: Environment
• Learner Profile: Communicator
• Standard: Understand how the distribution of land
and oceans affect weather and climate.
• Learning Target: Today I am learning how the
movement of air masses create fronts.
If it’s written in BLUE, you need to write it down.
Air Masses and Weather Fronts
Why do we need to know about
weather fronts?
See what
type of
weather we
are having.
Prepare for
severe
weather.
A boundary between two distinct
air masses is called a
weather front .
Weather Front Symbols
????Which is Which????
Types of Fronts
• There are 4
types of fronts:
– Cold Fronts
– Warm Fronts
– Stationary Fronts
– Occluded Fronts
A warm front occurs when a less dense
air mass rides up over a more dense air
mass.
• Warm air replaces cold air.
• Warm Fronts bring drizzly rain and are
followed by warm, clear weather.
Map Symbol
Warm Front Animation:
– http://ww2010.atmos.uiuc.edu/(Gl)/guides/crclm/act/gifs/fpr4.gif
– http://earthsci.org/processes/weather/weaimages/2e.gif
• Cold air moves under the less dense warm
air.
• Cold Fronts move quickly, bring
thunderstorms, heavy rain or snow and
cool weather follows.
Map Symbol
http://ww2010.atmos.uiuc.edu/(Gl)/guides/crclm/act/gifs/fpr2.gif
http://earthsci.org/processes/weather/weaimages/2g.gif
A warm air mass is caught
between two cooler air masses
• Forms when a warm air mass is caught
between two colder air masses.
• Cool temperatures
• Large amounts of rain and snow.
Map Symbol
•
http://www.uwsp.edu/geo/faculty/ritter/images/atmosphere/weather/cold_occlusion.gif
• Forms when a cold air mass meets a
warm air mass
• But, neither have enough force to lift the
warm air mass over the cold air mass.
• The two masses stay separated and the
front remains stationary.
symbol
Exit Ticket
• Write this on a separate sheet of paper
and hand it to me at the door.
• Describe what happens in a Warm Front.
What happens to the warm air? What
happens to the cold air? What type of
weather will it bring?