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Transcript of Weather Lab
Types of Precipitation
Types of Clouds
What is Weather
Thunder & Lightning
Feathery, wispy clouds found in high altitudes.
They are often seen in clear skies and mean good weather. These clouds also mean a change of weather is coming soon.
Made of ice crystals, these clouds are usually present in a high pressure system
Large, fluffy clouds resembling cotton balls.
They are mostly seen on a fair weather day at lower altitudes. Formed from water droplets, the higher sections of tall cumulus are made of ice crystals.
These clouds can be seen in both low and high pressure systems
Flat layer of low clouds.
Light rain, drizzle are likely to occur ad cause a gray over cast. This type of cloud is usually made up of liquid water droplets, except during cold winter storms where they are comprised of ice crystals.
Stratus clouds are usually present in low-pressure systems.
Condition of the air around us in a particular time and place
Weather tells us how air moves (wind) and what it might be carrying
Weather can only happen in Troposphere. 1 of the 5 layers of our atmosphere.
Air pressure decreases with a rise in temperature and increases with a drop in temperature
Cold Temperature = High Air Pressure
Hot Temperature = Low Air Pressure
- Warm air (it is less dense). Brings rain or changeable precipitation. Air rises and the water vapor in the air condenses and forms clouds.
Cold air (molecules shrink together). This pressure system usually brings fair weather.
- Where air mass meets another
Temp - Sun
Pressure - Air and Wind
Water - Clouds and Precipitation
If you know these three things you can predict the weather.
Weather is affected by 3 Things
Thunderstorms are the most powerful weather event.
Energy is formed in the cloud, unleashing the electricity in the form of lightning bolts
The sound of thunder is made by heated air expanding very rapidly and creating shock waves
Lightning is pure energy unleashed from the sky.
An electrical charge builds in the cloud until it is discharged causing a blinding flash and hitting the ground at 60,000 m/s and at about 55,000 degrees F.
Snowflakes are created inside the cloud by tiny ice crystals colliding and sticking together.
Most snow will turn to rain as it falls unless the air near ground is below 32 degrees
No two snowflakes are identical
Snow is not Frozen Rain
Hail is precipitation in the form of ice pellets.
Ice pellets from the top of the cloud fall in the cloud creating a film of moisture then up currents carry them back to the top where they go through the same process
Eventually they become too heavy and fall to the ground.
Hail can also collide and stick together creating large hailstones that can be dangerous
The atmosphere of earth is full of water vapor. Through the process of evaporation water from the ground and bodies of water turn into vapor and travel upward in the sky with warm air.
As the warm air filled with vapor moves up it hits cold air and condenses together to form tiny drops of water or ice.
These particles join together to form clouds. As the clouds grow in size the water drops join together, become heavy and fall to the earth as rain.
Rain is formed from the condensation of water vapor.
AIR PRESSURE LAB
WATER CYCLE LAB
The Water Cycle
What is Climate?
A long established pattern of weather
The pattern may vary or remain the same throughout the year
It is usually measured in terms of temperature and precipitation
How does weather affect us?
How does weather affect nature?
When water goes from a liquid to a gaseous state
When water vapor cools and turns back into water in the liquid form
When a cloud becomes too saturated with water or ice particles that it is pulled to the ground by the force of gravity
The atmosphere constantly tries to restore equilibrium of the pressure systems
This causes air to move from areas of high pressure to areas of low pressure
The constant movement of pressure systems creates wind
Winds are described by the
direction they are coming from