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Understanding Low Pressure Systems, Humidity, and Evaporation in Weather

This guide explores the dynamics of low pressure systems in the Southeast, the role of moisture in the atmosphere, and essential concepts of evaporation. It covers how evaporation works, its influencing factors, and how humidity is measured. Through practical examples, such as comparing water levels in glasses and understanding the drying process of a towel, we delve into the connections between air temperature, dew point, and relative humidity. Gain insights into weather patterns and the science behind evaporation to better appreciate daily weather variations.

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Understanding Low Pressure Systems, Humidity, and Evaporation in Weather

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  1. Current weather

  2. What type of weather is associated with the Low pressure system located in the South East?

  3. Do you remember how this thing works.

  4. Moisture in the atmosphere: How does it get there?

  5. Evaporation

  6. Define Evaporationwhat speeds it up? Wind, heat, surface area

  7. The glasses below are half-filled with water (50% full). Which glass contains more water?

  8. If air at 10°C can hold 10 gallons of water, and 5gallons are present, what % of the air is full of water? _______ • If the air can hold 10 gallons, and 10 gallons are present, what % of the air is full of water? ____________

  9. The amount of moisture in the air is referred to as?

  10. When the air is completely full of water it is considered?

  11. How is it measured ?

  12. Air temp = 84 Dew Point temp = 61High or Low pressure? Will a wet towel dry quickly or slowly today?

  13. Air temp 64 Dew Point temp 64Pressure system? Towel dry fast or slow

  14. Ever notice how you feel cold when you get out of the shower or pool? That’s because evaporation is a heating process. Water needs heat in order to evaporate and therefore it gets the heat from your Body.

  15. The same thing happens when you use a sling psychrometer.

  16. Because evaporation is pulling the heat out of the thermometer, the wet bulb is always colder than the dry bulb (or the same temp)

  17. Think about this. If it is raining out, will there be a lot of evaporation taking place

  18. So what will happen to the wet bulb temperature?

  19. Find the Dew Point for the following. Dry bulb temp =-8 Wet Bulb = -9Dry Bulb = 20 Wet Bulb = 16 Dry bulb = 2 R.H = 67. What is the Wet bulb Temp?Dry Bulb = 16, Dew Point = 11, what is the Relative Humidity?

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