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28 Cards in this Set

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  • Back
barometric pressure
caused by the weight of the atmosphere
Doppler Radar
device that can measure wind speed and faraway storms
Relative humidity
amount of water vapor in air compared with the amount of vapor the air can hold
isobars
lines that connect areas of equal atmospheric pressure on a weather map
dew point
temperature at which water vapor in the air begins to condense
station model
cluster of symbols on a weather map that describes the weather at one place
geostationary
describes a satellite that remains over the same spot on earth.
Air is generally what in the winter?
drier
Why do meteorologists study isobars?
wind direction and speed
What happens to the dew point as relative humidity increases?
The dew point rises
What is the pressure difference between two locations if the isobars are close together on a weather map?
The air pressure is greater.
How is wind speed near the ground measured?
with an anemometer
What senses radiation at night to determine cloud cover?
Satellites
What will the weather be like if the barometric readings are high?
Blue skies and sunshine.
What is the normal direction of movement for most weather systems in the US?
West to East
What two important facts impact the formation of dew?
Temperature and Relative humidity
Why does a mass of air, with high pressure bring clear, fair weather?
A mass of air with high pressure is thin and sinks toward earth as it sinks it warms up and can hold more moisture. The relative humidity decreases, water evaporates causing the weather to turn fair and clear.
How do geostationary satellites improve weather forecasting?
Satellites record weather information from 35,000 km above earth at regular intervals. These satellites record and send information about the weather patterns and storms.
What is reached when the air temperature cools to the temperature at which the water vapor in the air condenses?
dew point
What are the high altitude areas called where winds blow up to 250 knots?
Jet streams
Why does an accurate forecast require knowing distant climate conditions?
Weather travels around the world bringing weather changes. Good forecasting requires this data.
A weather vane points to the southwest. How would you describe the wind that is blowing?
It is described as a southwest wind blowing from the southwest toward the Northeast.
When does frost form?
When the dew point is reached at a temperature below the freezing level.
How does the weather information collected by satellites differ from the information collected by radar?
Satellites pictures show where clouds are, radar can determine which clouds are producing precipitation.
Why is it better to exercise when the relative humidity is low?
In high relative humidity the air is nearly saturated with water vapor, causing your sweat to evaporate much more slowly and this decreases the cooling effect normally provided by the sweat.
How does Doppler Radar differ from conventional radar?
Doppler radar can provide data on the speed of moving objects, within a storm an improvement over conventional radar. Also Doppler radar uses radio signals, conventional radar uses microwaves.
Why are weather satellites important tools for meteorologists?
Satellites provide an overall picture of huge weather systems, a series of these pictures shows the speed and direction of a storm system.
Why does the air feel drier in the winter than in the summer?
Cold air holds less water than warm air, so the relative humidity in the summer is higher than in the winter.