1. Do Now What causes weather?
What is the difference between weather and climate?

2. Climate vs. Weather Weather The current state of the atmosphere.
What is going on right now.
Caused by UNEVEN HEATING of the Earth’s surface
Climate
Average temperature and precipitation over many years.

3. Temperature Pressure Wind Humidity
Weather Factors
Temperature
Pressure
Wind
Humidity

4. = = Temperature Heat moves from where it’s HOT to COLD
Measure of the average kinetic energy of molecules in a substance =
More Kinetic Energy
Faster Molecular Movement
Less Kinetic Energy
Slower Molecular Movement =
Heat moves from where it’s HOT to COLD

5. The Earth (Re-radiates Sun’s Energy)
Temperature
What is the primary source of heat energy in the atmosphere?
The Sun
The Earth (Re-radiates Sun’s Energy)
Factors that affect temperature
Time of day
Time of year
Latitude
Elevation

6. Time of year and Temperature
Angle (Height in the sky) of the Sun = ANGLE OF INSOLATION
SUMMER: MORE HEAT
Sun is out longer and is higher in the sky
Summer
Winter
More direct angle
Less direct angle
WINTER:
LESS HEAT
Sun is not out as long and is lower in the sky

7. Latitude and Temperature
The further from the Equator you get the cooler the temperatures
The sun’s energy is
less direct.
Equator

8. Isotherms
Lines on a map that connect points of equal temperature

9. Do now
Describe how the height of the sun in the sky affects the temperature of an area

10. Do now
Describe what factors affect the temperature of an area and what the effect is. (ex. Elevation- higher elevations means colder temperatures.)
List the tool used to measure the following (look in your packet if you can’t remember)
Pressure
Temperature
Wind Speed
Wind Direction

11. Pressure- Measured with a barometer
Pressure is the weight of air pushing down.
Warm Air Rises (Low Pressure) Cool Air Sinks (High Pressure)
Describes the air systems that cause weather.
HIGH PRESSURES:
Cooler
Less Moisture H
Good Weather
LOW PRESSURES:
Warmer
More Moisture
Bad Weather L

12. Isobars
Lines on a map that connect points of equal pressure

13. Winds – Horizontal air movements
Winds are caused by differences in air pressure.
Wind blows from HIGH pressure to LOW Pressure
Winds named for the direction from which they come.
Ex. Wind from the south west = Southwesterly wind.
Ex. A breeze blowing onshore from the sea = sea breeze.
Wind vane – measures direction
Anemometer – measures wind speed

14. Land vs. Sea Breeze
Sea Breeze = Cooler, denser, high pressure air over water blows towards land, Low Pressure (Daytime).
Land Breeze - Cooler, denser, high pressure air over land blows towards sea, Low pressure (Night time).

15. Humidity Humidity is the amount of moisture in the air. (%)
High humidity  a lot of moisture
Will feel sticky outside
Precipitation most likely
Low humidity  less moisture
Will feel dry and comfortable
Precipitation not likely
Humid locations are near
large bodies of water

16. Do now
Describe how a sea breeze and a land breeze form.

17. Air Masses
Air masses are large bodies of air which have similar temperature and moisture characteristics.
Air masses form when air stays over a region (called the source region) for several days.
Air masses that form over water will be moist.
Air masses that form over land will be dry.

18. A = Arctic P = Polar T = tropic
c - continental = dry m - marine = moist
A = Arctic
P = Polar
T = tropic

19. Do Now Describe the properties of a cP air mass and a mT air mass
Explain what happens when wamr air and cold air meet

20. Fronts – boundary that separates 2 air masses with different temperatures
Air becomes unstable at fronts.
Produces:
Clouds
Strong winds
Precipitation
Other weather changes

21. Cold Front Cold air pushes out warm air, *snow Plow*
Move faster than warm fronts
Short-lived thunderstorms
Precipitation occurs at the frontal boundary.

22. Warm Front Warm air rises over cold air.
Longer and steady precipitation
Precipitation occurs far ahead of the front.