Nov 14 2012

Hazy Inversion

Published by at 7:30 am under Weather & Sky

Three weeks ago I wrote about radiation fog and inversions.  We had another inversion recently, this time without fog.

Here is the view last Sunday from the Allegheny Front Hawk Watch.  It looks like a bad picture of beautiful scenery but it’s actually a good illustration of a hazy inversion.  Notice how the near trees are colorful and Wills Mountain, 10.5 miles away,  is bland and washed out.  You can’t see the fire tower on Kinton Knob.  The colors are cancelled by bad air.

This was a classic temperature inversion but the first time I was able to measure it.  As I drove to the hawk watch my car’s outdoor thermometer registered 43o in the Laurel Highland valleys and 57o on top of the mountain.  Normally the hawk watch site is far colder than anywhere else in western PA.

The weather was topsy-turvy.  Warm air aloft trapped cold air below and with it pollutants that made the air smell bad in the cold zones.

Bad air was not limited to cities and industrial zones.  On my way to the Allegheny Front I saw quite a few outdoor wood boilers creating thick white smoke that blanketed rural areas.  These relatively new devices burn wood in backyard sheds to heat water for radiators in homes.  Because outdoor wood boilers are small scale polluters they weren’t on the bad air radar at first, but their smoke is much worse than typical burning because the fire smolders when indoor heat demand is low.  I saw valleys where wood smoke enveloped nearby homes and neighbors.

At the hawk watch the air was nice and warm.

So when there’s an inversion, go to the mountain.

(photo by Kate St. John)

4 responses so far

4 Responses to “Hazy Inversion”

  1. James Boydon 14 Nov 2012 at 5:31 pm

    Hi, I wanted to know why I haven’t seen any birds for the last few weeks! I live in Smithton, Pa. Even with it being colder there are always some around and they’re none!

  2. Kate St. Johnon 14 Nov 2012 at 5:51 pm

    I think I need some more clues to answer your question. Do you mean no birds at your feeder? No birds of particular species you like to see but pigeons and ducks our geese by the bridge over the Yough? No birds in one particular place? Let me know.

  3. Marcy Con 14 Nov 2012 at 6:44 pm

    Did I hear that TODAY was an inversion day?

  4. Kate St. Johnon 14 Nov 2012 at 7:32 pm

    There wasn’t an inversion here in Pittsburgh. The air moved around way too much for that. We had some wind.

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