Transcript Understanding Weather

Understanding Weather
Weather
• The condition of the atmosphere at a
certain time and place
TOOLS
Anemometer
•Used to measure wind
speed
Barometer
•Used to measure air
pressure
Radar
(Hurricane Ike)
Weather Balloons
psychrometer
• An instrument used for measuring relative
humidity. It has one “dry” bulb and one
“wet” bulb.
Air Masses
• A large body of air that has the same
temperature and moisture
• Get their moisture and temperature from
the area over which it forms
Air Masses
Fronts
• Boundary between two air masses
• Bring changes in the weather
• Fronts are named for the air that is
behind them
Cold Front
• Cold dense air pushes warm air out of
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the way
Moves quickly
Brings short periods of heavy
rain/thunderstorms/snow
Lower temperatures are behind the front
SYMBOL – the direction of the “arrows”
points towards the direction the front is
MOVING
Warm Front
• Warm air moves on top of the cold air
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mass, as it slowly pushes the cold air
Moves slowly
Brings many days of steady precipitation
Higher temperatures and clear skies are
behind the front
SYMBOL – direction of “half-moons” is
the direction the front is moving
Stationary Front
• The air from the warm front and cold
front meet, but do not move
• Cold air mass cannot force warm air
mass up
• Bring many days of steady precipitation
• SYMBOL – warm and cold fronts are
moving in opposite directions, thus
making a stationary condition
The End