Essential Question: How do fronts and pressure systems affect
weather patterns? Science 7 Slide 2 Next Science Test: Earths
Weather Unit Test Monday, October 12 Study guide is also posted
online Slide 3 Homework: Science Finish Weather Map if not complete
Slide 4 Most Missed Question: Review of the Day What type of air
mass would form over Russia in Northern Asia? A. Maritime tropical
B. Maritime polar C. Continental tropical D. Continental polar
Slide 5 Clouds: Vocabulary Large, puffy cotton-ball looking clouds
that tend to form in fair weather. CUMULUS CLOUDS Slide 6 Air
Masses: Vocabulary This is a large body of air in which temperature
and humidity are fairly constant at the same altitude. These can
cover large regions of hundreds or thousands of square kilometers.
AIR MASSES Slide 7 Air Masses: Vocabulary Every air mass can be
described with TWO WORDS: - Either Continental or Maritime - Either
Polar or Tropical Slide 8 Air Masses: Vocabulary Types of Air
Masses -Continental: form over continents -Maritime: form over the
oceans or large bodies of water -Tropical: form near the equator -
Polar: form in the very far north or in the very far south (close
to the poles) Slide 9 Clouds: Vocabulary Feathery, wispy looking
clouds that form in very cold air at high altitudes in the sky
CIRRUS CLOUDS Slide 10 Clouds: Vocabulary Thick, flat, blanket-like
clouds that cover the whole sky and are generally associated with
rain and stormy weather. STRATUS CLOUDS Slide 11 Clouds: Vocabulary
This is a word given to various kinds of clouds associated with
PRECIPITATION NIMBUS CLOUDS Slide 12 Weather: Key Vocabulary Two of
the systems used to measure temperature: FAHRENHEIT A temperature
scale on which the freezing point of water is 32 degrees and the
boiling point of water is 212 degrees CELCIUS A temperature scale
on which the freezing point of water is 0 degrees and the boiling
point of water is 100 degrees Slide 13 Greenhouse Effect Review:
What do greenhouse gases do? Absorb and trap infrared radiation
What are some examples of greenhouse gases? Water vapor, carbon
dioxide, methane What would happen to earth if there was NO
GREENHOUSE EFFECT in the atmosphere? Earth would be too cold to
support life Slide 14 Air Pressure: Vocabulary This is the total
force or weight of all of the air pushing on a given area; the
lower the altitude, the higher this is. AIR PRESSURE This is a
device for measuring air pressure. BAROMETER Slide 15 Layers of the
Atmosphere Review: Altitude Distance above sea level In what layer
of the atmosphere is the Ozone Layer located? As altitude
increases, the density of air __________. Slide 16 Global Wind
Belts: Vocabulary This is a global wind belt that flow along the
border of the troposphere and the stratosphere. It blows from West
to East. Jet planes will often fly within this wind belt when
traveling westward because it helps them to reduce the travel time.
Jet Stream Slide 17 Key Atmosphere Concepts that you MUST know! As
the temperature of air heats up, the air __________ (in other
words, it becomes ______ dense) As the temperature of air cools
down, the air __________ (in other words, it becomes _______ dense)
As Air Density Increases, Air pressure also _________________ As
Air pressure Decreases, air density also _________________ The most
common gas in the atmosphere (76%) is ___________________ The
second most common gas (22%) in the atmosphere is ________________.
Slide 18 Key Atmosphere Concepts that you MUST know! Fluids (such
as air) move from areas of ________ pressure to areas of ________
pressure Air pressure is different in different places on Earth
because Air moving from areas of high pressure to areas of low
pressure parallel to Earths surface is called _____.
________________ is a measurement of how much water vapor is in the
air. The warmer air is, the ______________ humidity it can hold.
When water vapor condenses on dust particles in the atmosphere,
___________ are formed Slide 19 Todays Topic: How do fronts and
pressure systems affect weather patterns? Slide 20 Fronts and
Pressure Systems: Vocabulary This is a boundary between two
separate air masses. The weather patterns at the border of air
masses is often very different from the rest of the air mass. FRONT
Slide 21 Fronts and Pressure Systems: Vocabulary This is a front
that forms when a cold air mass moves into an area and pushes a
warm air mass steeply upward and out of the way; these fronts
normally lead to brief heavy storms. On a weather map, this type of
front is represented by triangles on a line. COLD FRONT Slide 22
Fronts and Pressure Systems: Vocabulary This is a front that forms
when a warm air mass moves into an area and pushes a cold air mass
backward; the warm air mass than gradually moves up and over the
old air mass; these fronts normally lead to steady rain. On a
weather map, this type of front is represented by semicircles on a
line. WARM FRONT Slide 23 Fronts and Pressure Systems: Vocabulary
This is a front that forms when a cold air mass and a warm air mass
both push against each other without moving. This generally leads
to weather in which massive clouds cover the sky for days. On a
weather map, this type of front is represented by alternating
semicircles and triangles on a line. STATIONARY FRONT Slide 24
Fronts and Pressure Systems: Vocabulary This is a large weather
system that moves around a center of high air pressure in the
middle of the system. This type of weather system generally brings
clear skies and calm weather. High-Pressure System Slide 25 Fronts
and Pressure Systems: Vocabulary This is a weather system in which
the air circulates around a center with a low air pressure. This
type of weather system often form along fronts. This type of
weather system features high-winds, severe and stormy weather.
Low-Pressure System Slide 26 How do I recognize fronts and pressure
systems? After a cold front passes, the air is COOLER than it was
before. After a warm front passes, the air is WARMER than it was
before Clear skies and calm weather indicate a HIGH-PRESSURE SYSTEM
High-winds indicate a LOW-PRESSURE SYSTEM Slide 27 Using a Weather
Map to Identify Fronts and Pressure Systems: Slide 28 Exit Ticket:
Access the Exit Tickets page of DeBolts wiki Click on the link for
todays exit ticket Complete the quiz before leaving class Name
format: your period number, Last name, First name
