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Weather
State Objectives 4.c, 4.e, 4.h.
Discussion
What are some ways in which weather affects your everyday life?
What is Weather?
____________________ layer of gases surrounding Earth.
_______________ is the conditions of the atmosphere.
Temperature
Air Pressure
Humidity
Wind
Clouds
Precipitation
Main cause for changes in weather is energy from the ____________.
Temperature
Indicates the amount of ___________ (kinetic energy) in the atmosphere.
Represents the _______________ of the molecules.
The ________________ the temperature, the faster the air molecules are moving.
Warmer air rises and cooler air sinks which causes ___________________ currents.
Measured with a _______________________
Standard unit is ________________________ (°F)
SI Unit is _______________________ (°C)
Air Pressure/Barometric Pressure
Air has weight because it has ________________.
Air pressure is a ___________________ of the force of air being exerted on a given area of Earth’s surface.
As temperature __________________________ pressure decreases.
Cool air is more dense, which causes it to sink (high pressure).
As altitude ___________________ air pressure decreases.
Weather and Air Pressure
Changes in pressure indicate a change in __________________ is approaching.
________________________ pressure systems are associated with clouds & precipitation.
________________________pressure systems are associated with clear skies.
Steady pressure indicates current conditions will ___________________.
Measured with a _________________________
in inches of mercury or in millibars.
Humidity
Amount of _________________________in the air.
_______________ humidity is a ______________________of the amount of water vapor in the air compared to the
maximum amount of water vapor it can hold at that temperature.
The ___________________ the temperature the __________________ water vapor it can hold.
_________________________ means the air is holding 100% of the water vapor it can hold at that temperature.
Measured with a _______________________ or a psychrometer.
Dew point
Dew is the water vapor that has ___________________ on a surface into a liquid.
Depends on two factors:
Amount of _____________________ in the air
Temperature near the ______________
Dew point is the _____________________ at which water vapor condenses into a liquid.
Wind
Caused by differences in __________________
Air moves from areas of high pressure to areas of low pressure
Wind Speed
Measure of how ______________ the air is moving.
Measured with an _____________________.
Wind Direction
Direction from which the wind is _________________ NOT the direction it is blowing
Ex. North winds blow from N to S
Measured with a ________________.
Global Wind Patterns
Blow steadily across Earth in paths that are thousands of kilometers long
Steer weather in certain directions (usually _____________________ in the U.S.)
Caused by ______________________ from the sun
The sun does not heat the surface evenly causing uneven heating of the atmosphere.
____________________ winds: blow from east to west near the equator.
_______________________: blow from west to east in the mid-latitudes.
_________________________Effect: Earth’s rotation causes winds to curve to the right in the Northern Hemisphere and to
the left in the Southern Hemisphere.
Types of Global Winds
__________________________at high altitudes are bands of strong winds (up to 350 km/h) near the top of the troposphere at
the northern and southern boundaries of the prevailing westerlies.
 Race from __________________ to ____________________.
Clouds
Clouds form when air rises, cools, and condenses. They are classified according to their _______________ and
___________________.
Types of Clouds
1. _________________- a low, puffy cloud that forms on sunny days when heat from the surface causes warm air to rise.
2. _________________- a low, gray, sheet-like cloud that forms when warm, moist air moves over cooler ground. They are
seen most often during the winter and may bring steady rain.
3. __________________________ (thunderheads) - vertical clouds that may be over four miles tall. They form where cold
air forces warm air to rise quickly.
4. ___________________- high, featherlike clouds. They are the highest clouds in the sky. They do not produce
precipitation.
Precipitation
_____________________________________ – occurs when drops of water or crystals of ice become too large to be
suspended in a cloud and fall in the form of __________________________________________________________
The Water Cycle
Earth’s surface is about 70% water and it exists in all three states.
The _________________ is the constant movement of water on Earth.
The __________________ provides the energy for the water cycle.
Parts of the Water Cycle
1. ______________ occurs when water changes from a liquid into a gas after gaining heat energy from the Sun.
2. __________________ is the evaporation of water from the leaves of plants.
3. __________________occurs when water vapor changes into liquid water to form clouds or fog.
4. __________________ occurs when water droplets fall to Earth.
What is an Air Mass?
An _______________ is a large body of air that develops over a particular region.
It has _______________________of the area over which it develops.
___________________ air masses come from Canada and ___________________ air masses develop over Mexico.
Fronts
A __________________ is a boundary between two air masses.
When two fronts meet, the cold air mass will move under the warm air mass because the _________ air is more dense.
Types of Fronts
1. A _________________ forms when a cold air mass pushes under a warm air mass. Cumulus clouds form and
thunderstorms may occur.
2. A __________________ forms when a warm air mass moves up and over a cold air mass. Cirrus and stratus clouds form
and light, steady precipitation occurs.
Warm and Cold Fronts
Types of Fronts
3. A __________________ front forms when a warm air mass meets a cold air mass but neither advances.
4. An ___________________ front forms when a fast-moving cold air mass overtakes a slower warm air mass. Weather is
similar to, but less severe than, the weather along a cold front.
Meteorologists
A scientist that studies the weather & uses the data to make ____________________ about weather.
Observe patterns & create weather maps
A weather ____________________is a prediction of present conditions based on observations and data.
Weather Maps
_________________________: allow meteorologists to monitor weather on the global scale
_________________________: uses electromagnetic waves to monitor velocity and altitude.
Severe Weather
________________________: brief, intense storms produced by rapidly rising clouds. May produce hail
_________________________ is huge electrical discharges.
A ___________________ is a violent, whirling wind that moves in a narrow path over land.
Watches and Warnings
A __________________ is issued when conditions are favorable for severe weather to occur.
A ___________________ is issued when severe weather has been sighted.
The _______________________monitors weather and issues watches and warnings when appropriate.
What is a Hurricane?
A _____________________ is a low-pressure system that forms over tropical oceans.
Also called ____________________or tropical _________________________.
Named for the Mayan god Hurakan who blew his breath across the water.
Disturbances, Depressions, and Storms
A ________________________is an area of organized convection that originates in the tropics. It has no eye or rotation.
A ________________________is a cyclone that has a maximum wind speed of 38 mph.
A ________________________ has a wind speed between 39 mph and 73 mph.
Conditions Required for Formation
Warm ocean waters of at least ____________.
____________________________ in the troposphere.
An atmosphere that quickly cools with altitude.
A distance of at least ______________________ from the equator.
A surface system with ____________________________winds.
Low wind shear. _______________________ is the rate of wind speed or direction change with altitude.
Hurricane Formation
Parts of a Hurricane
The _______ is the circular area of calm, relatively light winds at the center of a hurricane. It is the area of
_______________ pressure.
The __________________is the ring surrounding the eye that contains the highest wind speeds.
______________________ are bands of heavy rain that spiral outward from the storm’s center.
Where Hurricanes Form?
When Hurricanes Occur
The Atlantic hurricane season lasts from ____________________
These dates include about 97% of hurricanes.
Most occur from August to October.
When Hurricanes Occur
 The Atlantic hurricane season lasts from __________________________________
 These dates include about 97% of hurricanes.
 Most occur from ___________________________.
Tracking Hurricanes
Hurricanes can be tracked using _______________, _____________ (near land), and hurricane hunters.
_________________________ is the nickname of the 53rd Weather Reconnaissance Squadron of the Air Force
Reserve. They are based in Biloxi, Mississippi.
Gathers data including ________________________________________________________________ from the planes
altitude to the water’s surface.
Paths of Hurricanes
Depends on where the hurricane forms.
Trade winds cause hurricanes to move __________ to ____________ near the equator.
As hurricanes move north, they begin to turn back to the ______________.
Effects of Hurricanes
_______________
_______________ and flooding
________________ after landfall
_________________is the rising wall of water that comes ashore with a hurricane. It causes the most damage and is
responsible for 90% of deaths.
Naming Hurricanes
Hurricanes are named to ease communication between the government, forecasters, and the public.
Naming Atlantic storms began in ______________________
2012 List of Names-Alberto, Beryl, Chris, Debby, Ernesto, Florence, Gordon, Helene, Isaac, Joyce, Kirk, Leslie, Michael,
Nadine, Oscar, Patty, Rafael, Sandy, Tony, Valerie, and William.
Rating Hurricanes
The ________________________ scale is uses wind speed to rate the strength of hurricanes.
Category _____ 74-95 mph Minimal
Category _____ 96-110 mph Moderate
Category _____ 111-130 mph Extensive
Category _____ 131-155 mph Extreme
Category______156+ mph Catastrophic
Strongest Hurricanes in History
___________________________(1979) was the most intense (lowest pressure) hurricane in history.
__________________________ (2005) was the strongest Atlantic hurricane.
Typhoon Nancy (1961) had maximum sustained winds (two minute average) of 213 mph.
Had a diameter of almost _____________________ miles.
Hurricane Katrina (2005)
Costliest hurricane in U.S. history ____________________ in damage).
Fifth deadliest hurricane (1,836 deaths)
Crossed Florida as a Category 1 but gained strength in the Gulf of Mexico.
Made landfall in Louisiana and Mississippi on August 29 as __________________________