Science Lesson 3
What does low pressure systems bring?
They often bring cloudy weather and precipitation.
Tell about Wind Speed
-It is measured anemometer (mph) -Wind= Higher pressure to Lower pressure
Tell about Air Pressure
-It is measured by a barometer(mb) -Warm air is less dense, making low pressure. -Cold air more dense, making higher pressure.
Tell about temperature
-It is measured by a thermometer(C,F) -Higher temps are faster moving air molecules. -Lower temps are slower moving air molecules and may freeze them
Tell about humidity
-Psychrometer(%) -It measures the percent of water molecules in the air -Higher air pressure, low water, low mb., high H2O
Tell about Precipitation
-Rain Gauge(inches) -rain, snow, sleet, hail
front
A boundary between two air masses
How fast can a jet stream flow?
A jet stream can flow at 300 km/h.
What characteristics do air masses take on from the surface they form over?
Air masses take the temperature band moisture characteristics of the surface.
How do air masses form?
An air mass form when a high pressure system stays over an area for several days
What are the air mass that form over land called?
Continental
Around a high-pressure system, the winds blow __________________________ and diverge.
Clockwise
Earth's rotation causes winds to blow ___________________________ around a low-pressure system and converge.
Counterclockwise
What happens when an air mass moves?
They transfer thermal energy from one area to another.
Cool air pressure puts _______________________ on Earth than warmer air.
Greater pressure
What evidence have you discovered to explain the relationship between pressure systems and weather?
High air pressure brings clear skies and weather; low air pressure brings cloudy weather and precipitation.
What weather patterns do you observe with each type of pressure system?
I observe heat and coolness.
When was jet streams discovered?
Jet streams were discovered during World War II.
Air pressure is the weight of the molecules in a ________________________________________.
Large mass of air
Warm air puts _________________________ on Earth than cooler air.
Less pressure
What are the air mass that form over water called?
Maritime
Weather changes ________________ to ________________ and ____________ to ___________.
Minute to Minute; Day to Day
In the lab 'Feel the Air', what evidence can you provide that the air in the containers was influenced by the material in the bowl?
My evidence is the ice was cold, making the bowl cold; The water was hot, making the bowl warm; The air produced sweat, which was room temperature.
jet stream
Narrow bands of high winds
What two jet streams directly affect the Northern and Southern Hemispheres and where is it located?
Polar and Subtropical jet streams; Polar jet streams are located around 30*N and 30*S of the equator, and Subtropical jet streams around 60*N and 60*S of the equator.
Where are polar jet and subtropical jets located?
Polar and subtropical jets are located in areas on Earth where temperature changes in upper atmosphere are greatest.
Where does a polar jet form?
Polar jets form at the boundary of cold, dry polar air to the north and warmer, moist air to the south.
Air in a low-pressure system ____________.
Rises
Sometimes, the weather stays the same for ___________________________________.
Several days in a row
What does high pressure systems bring?
They often bring clear skies and fair weather.
What evidence have you discovered to explain how weather is predicted?
The weather is predicted by the temperatures, air pressure, and other variables( wind speed, humidity, and precipitation)
Infer why the weather patterns you observed are associated with each type of pressure system.
They are associated with high- and low- pressures.
What evidence have you discovered to describe the relationship between weather and weather variables?
They both consist of temperatures, air pressure, wind speed, humidity, and precipitation.
What evidence have you discovered to explain how air masses contribute to weather?
They contribute because jet streams help cooler air masses go to the equator and warmer air masses go to the North South Poles.
What direction does jet streams flow around Earth?
They flow west to east, or ten making large loops to the north and south
What evidence supports the weather claim?
Variables change, making all of the weather patterns different and inaccurate.
Air masses can be _____________ or cool depending on the source region in which they form.
Warm
How does weather change?
Weather changes by the changes in variables and the rotation of Earth.
What evidence have you discovered to explain what happens when air masses collide?
When air masses collide, they make a front, which is known as a boundary between two air masses.
How does wind strength increases?
Wind strength increases when temperature changes between two locations increases.
How does air move?
air moves from areas of high pressure to areas of low pressure.
Air masses
large bodies of air that have uniform temperature, humidity, and pressure
