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Understanding Weather
• The condition of the atmosphere at a
certain time and place
•Used to measure wind
•Used to measure air
(Hurricane Ike)
Weather Balloons
• 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
• 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
the way
Moves quickly
Brings short periods of heavy
Lower temperatures are behind the front
SYMBOL – the direction of the “arrows”
points towards the direction the front is
Warm Front
• Warm air moves on top of the cold air
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
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