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Weather - 6th Grade

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William Begoyan

on 21 February 2018

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Transcript of Weather - 6th Grade

By: Mr. Begoyan
Page 37 in your ISN - Page 300-330 in your Textbook
Avid EQ: Where and how does weather originate?
Water in the atmosphere
The continuous movement of water between the Earth's surface and the atmosphere is called the
water cycle
Solar radiation
powers the
water cycle.
The water cycle has 4 parts.
Surface runoff
, water molecules in liquid state absorb energy and escape in gas form.
is the measure of the amount of water vapor in the air.
Maximum humidity is determined by temperature, with warmer air holding more water vapor than cold air.
Relative humidity
is based on air temperature.
are used to measure relative humidity.
Clouds form when water vapor (gas) in the atmosphere
in to liquid.
The temperature of the air has to cool before condensation takes place.
The temperature at which water condenses is called a
dew point.
There are 3 main cloud types:
Stratus clouds are found the closest to the surface, are uniform grey color, and will cover most of the sky.
Cumulus clouds are found a little higher than stratus clouds, and are puffy white in appearance, resembling cotton candy.
clouds are found at very high elevations (higher than any other cloud). They have a white, feathery, wispy appearance.
The prefix "
" can be added to clouds, which means tall. For example, Altostratus and Altocumulus are found at higher elevations.
The prefix "
" and the suffix "
" can be added to clouds, which means rain. For example, Nimbostratus and Cumulonimbus will produce drizzle, rain, or snow.
Clouds that form at or near the ground are called

is any form of water that falls from clouds and reaches the surface.
There are 5 primary types:
is the most common type, and is made of water droplets of at least 0.5mm in diameter.
Rain with smaller water droplets is called a
, while even smaller droplets form
is made of pellets of ice larger than 5mm in diameter.
Hail is primarily formed in the cold center of cumulonimbus clouds during thunderstorms.
In freezing (or near freezing) temperatures, water vapor turns into tiny ice crystals with varying patterns called snow.
is formed when rain droplets (5mm or smaller) encounter a cold layer of air and freeze before reaching ground.
When the surface is much colder than the air, rain droplets will freeze when they hit the cold ground, forming into layers of ice.
This is called freezing rain.
Air mass and fronts
Air Mass
is a huge body of air that has similar temperature, humidity, and air pressure.
There are 5 major types:
Maritime Tropical
: Warm and moist, formed over warmer waters.
Maritime Polar
: Cool and moist, formed over cooler waters.
Continental Tropical
: Warm and dry, formed on land, in warmer climates/locations.
Continental Polar
: Cool and dry, formed on land, in cooler climates/locations.
Continental Arctic:
Cold and dry, formed in the arctic.
The boundary where 2 different air masses meet is called a
There are 4 major types:
Questions part 1
1. What happens during the water cycle?
2. How does evaporation work?
3. What is humidity, and how is it different from relative humidity?
4. What are clouds made of?
5. What are the different types of clouds? Describe them.
6. What are the prefixes that can be attached to some clouds, and what do they mean?

form inside larger cumulonimbus clouds.
These clouds form on warmer, humid afternoons, when warm air is forced up by a cold front.
Most thunderstorms form on land where cold/warm fronts are likely to meet.
The constant motion in a thunderstorm builds up electric charges, and can rapidly discharge as

The lightning discharge can heat up air near it by as much as 30,000 C (more than double the temperature on the Sun's surface!).
The heat causes air to expand in an explosive manner, resulting in
When temperatures are below the freezing point, snowstorms replace thunderstorms.
Tornadoes (twisters)
form in cumulonimbus clouds when hot air rises very rapidly.

are low air pressure masses that spin in a clockwise direction.
Predicting Weather
Questions part 2
7. What qualifies as an air mass?
8. What are the masses that contain dry air?
9. What air masses form over land?
10. What is an air front?
11. Where do thunderstorm form?
12. Where do tornadoes form?
13. Describe a cyclone.
14. Who predicts weather, and what do they use?
is the study of weather.
are scientists who study and predict weather patterns based on data they receive from sources like:
Weather balloons, weather satellites, and weather stations scattered all across the world.
Homework - Page 36 in ISN
With the help of visuals, describe the water cycle, types of clouds, types of air masses, storms, and cyclones.
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