Warm-Up March 3Explain how humidity
change with temperature?
The higher the temperature, the higher the humidity . . . warm air can hold more water vapor than cold air.
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 climate and weather.
• Learning Standard: Today I’m learning about clouds because they form as a result of weather.
• Opening: Cloudiest place on Earth
• Work Session:Cloud Formation & Types PresentationCloud Worksheet
• Closing: Cloud Review
Where is the cloudiest place on Earth?
Ben Nevis in Fort William, Scotland
Opening:
Temperature: 38˚
Wind Chill: 38˚
Visibility: 7 mi
Humidity: 87%
Wind Speed: 3 mi S
What would you wear?
• Remnant of an ancient volcano• Highest mountain in Scotland
– 4409 feet from sea level• Maritime Sea breeze creates a chilling wind between 20-30 knots/hour• Fog is present on the mountain 80% of the time
What do all these events have in common?
Clouds
Cloud Formation• Clouds form when water vapor in
the air condenses• Water molecule attaches itself to
a particle of dust (condensation nuclei)
Cloud Formation Animationhttp://
prism.engineering.asu.edu/research/anima.php
Cloud Formation – National Geographichttp://www.natgeoeducationvideo.com/film/1198/cloud-formation
How does water vapor get into the air?
Where does the cloud nuclei come from?
Volcanoes, pollution, cars, sea spray from the ocean, and fires
• In 1802 an Englishman by the name of Luke Howard invented the cloud naming system
• Latin names to describe clouds. • The first part of a cloud's name describes
height, the second part shape.
Why do clouds have such unusual names?
How can air pollution
affect weather?The more pollutants in the air, the more
things the water molecules can attachto, the more it might precipitate.
The prefixes denoting
Heights• Cirro high clouds above 20,000 feet
• Alto and mid level clouds between 6,000 - 20,000 feet
• There is no prefix for low level clouds.
• Cirrus mean curly or fibrous
• Stratus means layered
• Cumulus means lumpy or piled • Nimbo or nimbus indicates that a cloud can
produce precipitation.
Shapes
• Given that information, describe what each of the following clouds would look and act like?
• Cumulonimbus
• Nimbostratus
• Cirrocumulus
• Altostratus
Lumpy or piled up + precip.
Precipitation + layered
High + Curly
Mid-level + layered
Cumulonimbus CloudsPhotograph by Corbis Premium Collection/Alamy
• the highest of all clouds• 50,000 feet (15,000 meters). • distinctive anvil-top shapes occur because of high winds
Saskatchewan Thunderheads (Cumulonimbus clouds)Photograph by Mark Duffy/Alamy
• associated with severe storms• form when warm, humid air cools enough that water vapor condenses around tiny particles to form water droplets or ice crystals.
Lenticular CloudsPhotograph by Arco Images/Alamy
• The summit of Washington's Mount Rainier • formed by high winds blowing over rough terrain • sometimes described as a "stack of pancakes."
Golden Gate Bridge - Fog