Weather Review
Atmosphere in Motion
Winds blow from _____ pressure to
_______ pressure.
Winds blow from High pressure to Low
pressure.
They also blow from COLD to WARM air
How would you describe the winds in the NE
section of the US?
How would you describe the winds in the NE
section of the US? HIGH
WHY?
How would you describe the winds in the NE
section of the US? HIGH
WHY?
Isobars are very
close together
indicating large
change in pressure
A
B
Remembering that winds are
named by the direction from
which they come, which one of
these is a land breeze?
Remembering that winds are
named by the direction from
which they come, which one of
these is a land breeze?
A
B
B is a land breeze. Explain why.
Remembering that winds are
named by the direction from
which they come, which one of
these is a land breeze?
A
B
B is a land breeze. Because the
land cools off very quickly at
night, while the ocean
temperature stays basically the
same. Since Winds blow from
cool to warm, the breeze at
night comes from the land.
Remembering that winds are
named by the direction from
which they come, which one of
these is a land breeze?
A
B
A is a sea breeze. During the
day, the land heats up much
more quickly than the water,
and therefore, since wind blows
from cool to warm, the breeze
comes from the water.
Air movement
•Put: conduction, convection and
radiation in order of how air masses are
formed. (Describe a convection current)
•Put: conduction, convection and
radiation in order of how air masses are
formed. (Describe a convection current)
Radiation – heats up the land
Conduction – heats up the air
Convection – moves the warm
air around
Draw a cold front and describe the
associated weather
Draw a cold front and describe the
associated weather
Cold dry air collides with warm moist air
Cooler temps, rain, storms
Draw a warm front
Draw a warm front
Warm air rises up and over the cooler more dense air
List the four terms associated with describing
air masses
List the four terms associated with describing
air masses
Maritime – moist
Continental – dry
Polar – cool/cold
Tropical – warm/hot
Name the air mass that would form over the
Gulf of Mexico
Name the air mass that would form over the
Gulf of Mexico
Maritime Tropical =
warm and moist
Explain why coastal climates are
cooler in the summer and warmer in
the winter
Water does not
heat up or cool
down as fast as
land, so the sea
breezes near the
coastal areas
keep those
temperatures
more moderate
(average)
What causes hurricanes to form?
Hurricanes start as tropical storms near the tip of
Africa. They travel across the Atlantic Ocean
picking up LOTS of warm moist air – which causes
EXTREMELY LOW PRESSURE on the surface.
EQUIPMENT USED FOR FORECASTING
barometer
thermometer
Psychrometer
(humidity)
Anemometer
(wind speed)
Describe the formation and results of
Low pressure
Describe the formation and results of Low
pressure
• Low pressure is formed as warm air rises, leaving less air molecules at
the surface.
• As the warm air rises, it cools, condenses and forms clouds.
• Resulting weather is usually warmer and cloudy
Describe the formation and results of
High pressure
Describe the formation and results of
High pressure
Cool, dense air aloft sinks,
pushing air molecules
toward
The surface. With the
added pressure, clouds
are unable to form, so
clear skies prevail.
CONTINENTAL POLAR
CLEAR
WINDY
COLD FRONT
RAINY
MARITIME TROPICAL