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dreel(at)cox.net
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 Posted: Thu Jul 13, 2006 11:27 am Post subject: Haze |
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The FAA aviation weather book describes haze as a yellowish or bluish tinged
uniformly distributed contaminant formed from salt or dust particles. A
temperature inversion keeps them from being diluted. Flying in haze
yesterday, I started wondering why it seemed to thicken as I ascended. And
why do ground stations report 6 miles when you can't see 6 miles from one
mile agl? The book also says visibility is reduced toward the sun but I
thought having the sun behind you would lessen visibility because of
reflection from the particles back toward your eye. Any thoughts/info?
Dave Reel - RV8A
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jjessen
Joined: 22 Apr 2006
Posts: 285
Location: OR
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| Posted: Thu Jul 13, 2006 12:10 pm Post subject: Haze |
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Only thing I know is that I had a white out due to the sun and inversion and
I was not IFR rated. Thank the good CFI who made me work under the hood all
that time.
John Jessen
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ogoodwin(at)comcast.net
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| Posted: Thu Jul 13, 2006 12:10 pm Post subject: Haze |
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The book is correct. Haze or pretty much any restriction to visibility is
worse when looking into the sun. I've seen 10+ miles reported vis go to
less than a mile in practical terms when looking into the sun. You could
still see 10 miles or so to the sides, but looking into the sun, nada. You
know the runway's up there somewhere, but it's invisible. That's when it's
nice to have some form of nav showing alignment with the runway, be it a
localizer, gps, or whatever.
As for the reported vis, it's taken from the ground, so it won't be the same
as at 5000 agl. Sometimes the vis gets better at higher altitudes,
sometimes it gets lots worse.
do not archive
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bicyclop(at)pacbell.net
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| Posted: Thu Jul 13, 2006 12:27 pm Post subject: Haze |
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Here in SoCal haze tends to be a little on the brown side of white. The
visibility that ground stations are supplying is just that - ground
visibility. It may be different in the air. Maybe it's seeming thicker
to you because you're looking down through more of it as you climb. When
you were looking up through it, there was nothing much on which to focus
on the other side of it. It is definitely worse flying into the sun when
it is low in the sky. There's been times near sunset when the visibility
was OK to the sides and rear but just about nil ahead. A good time to
turn on your landing lights and look for another way to go.
Pax,
Ed Holyoke
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