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Ronnie-Science-Chapter 8 - Weather - Sections 3,4,5

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Scientists predict weather using
weather instruments
Weather instruments
Thermometer, Anemometer, Wind vane, hygrometer, barometer, rain gauge
Thermometer
measures temperature in degrees
Anemometer
measures wind speeds
Wind vane
measures directions the wind is blowing
Change in wind direction on wind vane means
change in weather
Hygrometer
measures the humidity in the air
Barometer
measures air pressure
Rain gauge
measures the amount of rainfall
Satellites
used to study the movement of storms
Weather balloons
collect data on temperature, air pressure and humidity
Radar
looks inside clouds
Air masses
are several miles thick and 1,000 miles across
Temperature & humidity
about the same throughout an air mass
Neighboring air mass
may have a different temperature, humidity and weather
Cold air masses
form in cold air regions
Warm air masses
form in warm regions
Location of air masses
some over land and some over water
Masses over land
are usually dry
Masses over water
are usually humid
Fronts
where two air masses meet
Cold front
the edge of a moving mass of cooler air
Warm front
the edge of a moving mass of warm air
Warmer temperatures
are brought by a warm front
When a fast moving warm air mass meets a cold air mass
the lighter warm air mass rides up over the heavier cold air
Clouds
form when the warm air rises and cools and the water vapor condenses
Thicker lower clouds
can cause light rain that lasts for hours or days
Cooler temperatures
are brought by a cold front
Cold front forms
where a faster moving cold air mass meets a warm air mass.
Faster heavier cold air
plows under the warm air and it pushes the warm air up sharply
Water vapor
condenses to form clouds
Severe weather
from cold front, can include tornadoes