weather conditions and tools weather unit. weather changes occur day to day and from season to...
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Weather Conditions and Tools
Weather Unit
Weather changes occur day to day
and from season to season.
In order to understand In order to understand daily weather daily weather
conditions, weather conditions, weather data must be collected data must be collected
accurately using accurately using weather instruments.weather instruments.
Wind SpeedWind Speed
The condition of how fast the air is moving
Wind SpeedWind SpeedMeasured with an
anemometer as the wind causes the cups to spin
AnemometerWind speed is
measured with an anemometer as the wind causes cups to
spin
AnemometerHow 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
Wind DirectionWind Direction
The condition determined by where the
wind/moving air is coming from
Wind vaneWind direction is determined with a
wind vane (weather vane). Wind direction
is described by the direction from which the wind is blowing.
Describing Wind Describing Wind DirectionDirection
PrecipitationPrecipitation
The condition of the type of water falling to Earth
from the clouds
Rain gaugeAmount of
precipitation is measured in a rain
gauge. Markings on the side show how
much rain has fallen.
Rain gaugeHow 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.
TemperatureTemperature
The condition of how warm or cold the air is at
a given time
ThermometerAir 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.
ThermometerHow does it work?
Seasons of the year change!
Winter Spring
Fall Summer
As the seasons of the year change, temperature changes may
cause precipitation changes.
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.
Weather Weather ConditionsConditions
•fair weather
•showers or light rain
•clear skies with cold temperatures
•days of clouds
•days of precipitation
•windy fair days
•windy stormy weather
Weather patterns involve Weather patterns involve weather conditions that are weather conditions that are repeated due to the season repeated due to the season
of the year.of the year.
Example: Summer temperatures Example: Summer temperatures are generally warmer than winter are generally warmer than winter
temperatures.temperatures.
Weather SignsWeather Signs•looking at clouds
•noticing changes in wind speed and noticing changes in wind directions [These can indicate storms or temperature changes.]
Weather Weather PredictionsPredictions
Based on qualitative and quantitative data--
NOT JUST GUESSES!NOT JUST GUESSES!
The predictions are based upon a combination of types of data.
MeteorologistsMeteorologistsMeteorologists interpret information from a variety of sources and use those sources to
make predictions.
http://www.wistv.com/
MeteorologistsMeteorologistsThe information they use is shown on a
weather map.
Weather MapsWeather MapsMay show large masses of warm or cold air moving…Lines between the air masses are
called fronts.
Weather MapsWeather MapsMay show large masses of warm or cold air moving…Lines
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.
Data related to temperature and Data related to temperature and precipitation can also be found on a precipitation can also be found on a
weather map.weather map.
Weather Conditions and Tools
Weather Unit