Weather Conditions and Tools

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Weather Conditions and Tools

• Weather Unit

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Weather changes occur day to day and from season
to season.
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In order to understand daily weather conditions,
weather data must be collected accurately using
weather instruments.
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Wind Speed
The condition of how fast the air is moving
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Wind Speed
Measured with an anemometer as the wind causes
the cups to spin
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Anemometer
Wind speed is measured with an anemometer as the
wind causes cups to spin
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Anemometer
How does it work? As the cups spin, the
anemometer counts how many times they spin in a
given period of time. The more turns, the
faster the wind speed
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Wind Direction
The condition determined by where the wind/moving
air is coming from
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Wind vane
Wind direction is determined with a wind vane
(weather vane). Wind direction is described by
the direction from which the wind is blowing.
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Wind vane
How does it work?
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Describing Wind Direction
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Precipitation
The condition of the type of water falling to
Earth from the clouds
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Rain gauge
Amount of precipitation is measured in a rain
gauge. Markings on the side show how much rain
has fallen.
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Rain gauge
How does it work? Rain falls and collects in the
rain gauge. Markings on the side show the amount
of rain that has fallen. Measures rainfall in
inches.
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Temperature
The condition of how warm or cold the air is at a
given time
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Thermometer
Air temperature is read using a thermometer. The
scale may be read in degrees Fahrenheit or
Celsius. Air temperature should be measured out
of direct sunlight.
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Thermometer
How does it work?
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Seasons of the year change!
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As the seasons of the year change, temperature
changes may cause precipitation changes.
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Northerly winds may bring colder air than
southerly or westerly winds.What does that
mean?Winds blowing from the north may be colder
than winds blowing from the south or west.
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Weather Conditions

• fair weather
• showers or light rain
• clear skies with cold temperatures
• days of clouds
• days of precipitation
• windy fair days
• windy stormy weather

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Weather patterns involve weather conditions that
are repeated due to the season of the
year.Example Summer temperatures are
generally warmer than winter temperatures.
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Weather Signs

• looking at clouds
• noticing changes in wind speed and noticing
  changes in wind directions These can indicate
  storms or temperature changes.

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Weather Predictions
Based on qualitative and quantitative data-- NOT
JUST GUESSES! The predictions are based upon a
combination of types of data.
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Meteorologists
Meteorologists interpret information from a
variety of sources and use those sources to make
predictions.
http//www.wistv.com/
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Meteorologists
The information they use is shown on a weather
map.
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Weather Maps
May show large masses of warm or cold air
movingLines between the air masses are called
fronts.
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Weather Maps
May show large masses of warm or cold air
movingLines between the air masses are called
fronts.
Warm fronts When a warm front passes over an
area, the air temperature increases.
Cold fronts When a cold front passes over an
area, the air temperature decreases.
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Data related to temperature and precipitation can
also be found on a weather map.
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Weather Conditions and Tools

• Weather Unit