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Understanding Weather Measurements for Accurate Forecasting

Learn how to measure key weather elements such as temperature, pressure, wind speed, direction, humidity, and precipitation using tools like thermometers, barometers, anemometers, and rain gauges. Understand the importance of relative humidity in weather prediction.

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Understanding Weather Measurements for Accurate Forecasting

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  1. How do we measure the weather?

  2. Weather • The daily atmospheric conditions • Includes temperature, pressure, wind speed and direction, relative humidity, and precipitation.

  3. Temperature • Thermometer: Degrees Fahrenheit or Degrees Celsius.

  4. Pressure • A barometer measures atmospheric pressure in inches or millibars. Normal pressure at sea level is about 30 inches or 1013 millibars of pressure.

  5. Wind Speed • Anemometer

  6. Wind Direction • Wind Vane/Weather Vane. The pointer shows the direction of the wind.

  7. Relative Humidity • Psychrometer • Relative humidity is a measure of the amount of water in the air compared with the amount of water the air can hold at the temperature it happens to be when you measure it. • For example, you measure 20 grams of water vapor at room temperature. At room temperature the air can hold 40 grams of water vapor. • Relative humidity = 20 grams/40 grams = 0.5 * 100= 50% humidity.

  8. Precipitation • Rain Gauge or Meter Stick (for snow and ice)

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