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  2. Humidity - Wikipedia

    en.wikipedia.org/wiki/Humidity

    In a scientific notion, the relative humidity (or ) of an air-water mixture is defined as the ratio of the partial pressure of water vapor in air to the saturation vapor pressure of water at the same temperature, usually expressed as a percentage: [11] [12] [5] = % /

  3. Dew point depression - Wikipedia

    en.wikipedia.org/wiki/Dew_point_depression

    For a constant temperature, the smaller the difference, the more moisture there is, and the higher the relative humidity. In the lower troposphere, more moisture (small dew point depression) results in lower cloud bases and lifted condensation levels (LCL). LCL height is an important factor modulating severe thunderstorms.

  4. Convective condensation level - Wikipedia

    en.wikipedia.org/wiki/Convective_condensation_level

    In the atmosphere, assuming a constant water vapor mixing ratio, the dew point temperature (the temperature where the relative humidity is 100%) decreases with increasing height because the pressure of the atmosphere decreases with height.

  5. Dew point - Wikipedia

    en.wikipedia.org/wiki/Dew_point

    The dew point of a given body of air is the temperature to which it must be cooled to become saturated with water vapor. This temperature depends on the pressure and water content of the air. When the air is cooled below the dew point, its moisture capacity is reduced and airborne water vapor will condense to form liquid water known as dew. [1]

  6. Orland Park, IL Weather - Hourly Forecasts and Local ... - AOL

    www.aol.com/weather/forecast/us/orland-park-12784170

    32 ° F 0 ° C. 33 ° F 1 ° C. 29 ° F-2 ° C. 51%. 7:16AM Sunrise. 76% Humidity. 30.28 in Pressure--UV Index. 4:26PM Sunset. ... Weird winter weather: Cold and snow to the East, but rain and ...

  7. Psychrometrics - Wikipedia

    en.wikipedia.org/wiki/Psychrometrics

    In this example the humidity ratio is 0.0126 kg water per kg dry air. Determining the effect of temperature change on relative humidity: For air of a fixed water composition or moisture ratio, find the starting relative humidity from the intersection of the wet and dry bulb temperature lines. Using the conditions from the previous example, the ...

  8. Wet-bulb temperature - Wikipedia

    en.wikipedia.org/wiki/Wet-bulb_temperature

    The wet-bulb temperature is the lowest temperature that may be achieved by evaporative cooling of a water-wetted, ventilated surface.. By contrast, the dew point is the temperature to which the ambient air must be cooled to reach 100% relative humidity assuming there is no further evaporation into the air; it is the temperature where condensation (dew) and clouds would form.

  9. Lifting condensation level - Wikipedia

    en.wikipedia.org/wiki/Lifting_condensation_level

    If the air parcel is lifting further beyond the LCL, water vapor in the air parcel will begin condensing, forming cloud droplets. (In the real atmosphere, it is usually necessary for air to be slightly supersaturated, normally by around 0.5%, before condensation occurs; this translates into about 10 meters or so of additional lifting above the ...