Tuesday, September 20, 2011

"It's Like I'm Driving in a Cloud..."


Was this what it looked like for your drive in this morning? If so, you are not alone. A dense fog advisory is in effect until 10 AM this morning. The counties included in this advisory are Dekalb, Kane, DuPage, Cook, La Salle, Kendall, Grundy, Will, Kankakee, Livingston, Iroquois, Ford, Porter, Newton, Jasper, Benton, and Lake County, IN. A Dense Fog Advisory means that visibility will be reduced to less than one quarter mile.




In this visible satellite image, you can see the low lying fog in northeast IL and into Indiana.




National Geographic





Quick Notes About Fog:

  • The scientific definition of fog is a suspension of fine water droplets(that do not fall to the ground) that greatly reduces visibility. A simpler definition of fog is a low lying cloud(stratus).
  • Criteria for fog: Clear skies at night, moist ground, light winds, suppressed daytime heating, dewpoint depressions 20°F or less, and/or pollution.
  • There are different kinds of fog: Radiation, frontal, advection, sea, and ice fog.





-Meteorologist Heather Brinkmann

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