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WEATHER
By: Jimmy Burgard
What is evaporation?
• evaporation is the process by which water
changes from a liquid to a gas or vapor.
• if you put an ice cube on the ground in
the summer it will melt and then it will
evaporate.
• The higher temperature the more
evaporation
1.
What is condensation?
• Condensation is the accumulation of
water vapor changing to liquid water
onto a surface.
• Condensation occurs when
the temperature of any surface falls below
the dew point.
2.
What is precipitation?
• Precipitation is also part of the
hydrologic cycle.
• You’ve already learned that the
main forms of precipitation are rain,
hail, snow, sleet, and freezing rain.
3.
http://ellerbruch.nmu.edu/classes/cs255f02/cs255students/abarker/P4/watercycle.htm
l
What causes rain?
• Warm air can hold more water than
cool air, so when the warmer air is cooled
the moisture condenses to liquid - and it
rains.
4.
Cirrus clouds
• cirrus clouds are the highest in
elevation.
• Form above 20,000 feet.
• the temperature at that elevation is
so cold that cirrus clouds are usually
composed of ice crystals.
• This can only happen when the
temperatures reach below -38 degrees
Celsius.
5.
http://ellerbruch.nmu.edu/classes/cs255f02/cs255students/abarker/P4/cirrus.html
Cumulus clouds
• cumulus clouds are probably the
most recogonized clouds out of all
of the cloud types.
• cumulus clouds appear so
fluffy because bubbles of air
called thermals, linger in the
cloud making it have this kind
of look.
• cumulus clouds form below 6,000
feet.
• But in some extreme cases
they can be in altitudes as high
as 39,000 feet.
6.
http://ellerbruch.nmu.edu/classes/cs255f02/cs255students/abarker/P4/cumulus.html
Stratus clouds
• stratus clouds are uniformed layered
clouds that are below 6,000 feet.
•They can form only a few hundred feet
above ground.
• they are shallow but cover a
large area and they can bring
precipitation.
• stratus clouds are more known for
drizzle than for precipitation
7.
The four seasons in order
8.
• spring
9.
10.
• summer
•Fall
11.
• winter
12.
The four types of precipitation
13.
Rain
• rain occurs when warm air rises,
cools, condenses.
• the dew point is reached, the air
becomes saturated and water
droplets fall from the clouds.
14.
Snow
• snow occurs when the air temperature is
below freezing.
• water droplets freeze and fall as snow
flakes.
15.
Sleet
• sleet forms when the water droplets fall and
freeze before they reach the surface of the
earth.
• the temperature of the clouds are above
freezing.
• the temperature close to the earth surface is
below freezing.
16.
Hail
• hail forms in high level clouds where the
temperature is below freezing.
• the water droplets in the clouds
freezes.
• the surface temperature of the earth is above
freezing.
17.
Air masses
Continental
maritime
Type of land
air
symbol
Form over land
Dry air
c
Form over water / ocean
Wet air
m
polar
Form in the north
Cold air
P
Tropical
Form in the south
Warm air
T
arctic
Very cold
A
18.
High + low pressure
Type of pressure
type of weather
High pressure
Nice weather
Low pressure
Worse weather
19.
FrontPressure-
A boundary between two different air masses is called a front.
Atmospheric pressure is determined by the temperature
and density of the air and the amount of water vapor in it.
PrecipitationTemp-
Storms and precipitation occur at fronts.
Fronts usually bring a chance in temperature.
Direction-
Fronts always bring a chance in wind direction.
Air mass-
A air mass is a large body of air with the same
properties as earth’s surface under it.
Isotherm-
A line connecting points of equal temperature is a isotherm.
20.
Station model-
A station model shows the weather conditions at one
specific location.
What is the dew point?
Rain drops that pass through a layer of freezing air near Earth’s surface forming pellets.
What is sleet?
What is fog?
The temperature at which condensation forms from saturated air.
A stratus cloud that forms near the ground.
The amount of water vapor in the air.
What is humidity?
What is wind?
Air moving in a specific direction.
What is relative humidity?
What is weather?
A description of the current state of the atmosphere.
What is temperature?
What are clouds?
The measurement of the amount of water vapor in the air compared to
the amount needed for saturation at a specific temperature.
A measure of the average of motion of molecules.
Objects that form as warm air rises, expands, and then it cools.
What are types of precipitation?
Rain, snow, sleet, and hail.
What is caused by the interaction of air, water, and sun?
21.
The weather.