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Forecasting the Weather (PowerPoint)

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					Forecasting the Weather




                          1
                 Weather
• Weather: The daily conditions of a particular
  area: temp, rain, pressure, wind, etc.

• Climate: the measure of weather over a very
  long period of time—at least 100 years

• Meteorology- the science of studying
  weather
                                                  2
     What is a weather
        forecast?
• Forecast: A prediction of weather
  over the next 3-5 days.




                                      3
    What is a meteorologist?
• Meteorologist: A person who
  observes the atmosphere, collects
  data, and makes predictions—
  forecasts—based on the data.

• Meteorologist = weather person

• You know them as weathermen and
  weatherwomen.                       4
    What do meteorologists measure?

•   Air pressure
•   Humidity
•   Precipitation
•   Temperature
•   Wind speed
•   Wind direction



                                      5
            Weather balloons
Pictures courtesy of http://www.srh.noaa.gov/epz/kids/balloon.shtml:




                                                                       6
      Weather Instruments



             Thermometer   Doppler
Anemometer
                           Radar




Wind Sock    Barometer     Weather
                           Satellite   7
          Weather Balloons
• Weather balloons: Carry equipment as
  high as 30 km above the Earth’s surface

• Measure temperature, air pressure,
  relative humidity, wind speed, & direction




                                               8
             Thermometer
• Thermometer: Used to measure:
  – air temperature




                                  9
              Barometer
• Barometer: Used to measure air pressure




                                            10
           Psychrometer

An instrument used for measuring the water
 vapor content of the atmosphere; a type of
 hygrometer.
            Anemometer
• Used to measure wind speed




                               12
              Wind Sock
• Used to measure wind direction




                                   13
    Wind Vane/Weather Vane
• Used to measure wind direction




                                   14
                 Radar
• Used to find location, movement, kind &
  amount of precipitation




                                            15
16
          Weather Satellite
• Orbit the Earth & send information back to
  Earth; used to track storms, wind speed,
  humidity, & temperature @ different
  altitudes




                                           17
18
  Collecting & Analyzing Weather
               Data
• 2 groups who gather information:

  – National Weather Service (NWS)

  – NOAA (National Oceanographic &
    Atmospheric Administration)




                                     19
                  NWS
• Produce maps based on information
  gathered from over 1,000 weather stations
  nationwide




                                          20
             Station Model
• A small circle that shows the location of a
  weather station

• Surrounding the small circle is a set of
  symbols & numbers that represent
  weather data



                                                21
Example of a Station Model




                             22
Weather Map Symbols
                         High Pressure
     Cold Front
                         Clear Weather


    Warm Front
                        Low Pressure
                        Cloudy Weather
     Occluded Front

                            Isobars:

     Stationary Front       Show equal
                            Lines of
                            Pressure.


                                         23
               Cold Front
• Represented by triangles on a line




                                       24
              Warm Front
• Represented by half-circles on a line:




                                           25
            High Pressure
• Usually brings clear, sunny weather




                                        26
            Low Pressure
• Bring rainy weather




                           27
                 Isobars
• Lines that connect points of equal
  pressure on a weather map




                                       28
ISOBARS- Certain weather maps allow us to view High and Low pressure
systems that control the weather. An isobar is a line connecting locations of
equal barometric pressure. Isobar maps show where pressures are relatively
high and low, and show us where pressure changes are gradual or dramatic
                                                                           29
over a distance.
30

				
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posted:12/5/2011
language:English
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