Saturday, January 13, 2024

Pic(k) of the Week: Jogging in the fog

Jogging in the fog

When both the dew point and the temperature are 9 °C (48 °F), a jogger disappears into a fog bank.

Freedom Park, in the Candler Park neighborhood of Atlanta, Georgia, USA, 3 December 2017.
Freedom Park is is the largest public park in Atlanta, Georgia, comprising 210 acres of linear green space and six miles of hiker/biker trails. The park was created in 1992 from condemned land which originally was to be the Stone Mountain Freeway, a multi-lane divided-highway that would have bisected nine historic neighborhoods and destroyed a string of parks designed by Frederick Law Olmsted.
Freedom Park and Parkway.


  • The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity of 100%. At this point the air cannot hold more water in the gas form. If the air were to be cooled even more, water vapor would have to come out of the atmosphere in the liquid form, usually as fog or precipitation.

    The higher the dew point rises, the greater the amount of moisture in the air. This directly affects how "comfortable" it will feel outside. Many times, relative humidity can be misleading. For example, a temperature of 30 °F and a dew point of 30 °F will give you a relative humidity of 100%, but a temperature of 80 °F and a dew point of 60 °F produces a relative humidity of 50%. It would feel much more "humid" on the 80 degree day with 50% relative humidity than on the 30 degree day with a 100% relative humidity. This is because of the higher dew point.

    So, if you want a real judge of just how "dry" or "humid" it will feel outside, look at the dew point instead of the relative humidity. The higher the dew point, the muggier it will feel.
    National Weather Service

  • Pic(k) of the Week: one in a weekly series of images posted on Saturdays.
  • Photo 2 of 52, for year 2024. See a hi-res version on Flickr: here.
  • Commercial reproduction requires explicit permission, as per Creative Commons.

  • Camera: Olympus Pen E-PL1.
    • Lens: Olympus M.14-42mm F3.5-5.6 II R.
    • Settings: 35 mm | 1/320 sec | ISO 250 | ƒ/5.2

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