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Location: UFOUpDatesList.Com > 2007 > Jan > Jan 10

Re: O'Hare Sighting Cloud Hole Effect - Shough

From: Martin Shough <parcellular.nul>
Date: Tue, 9 Jan 2007 16:58:52 -0000
Fwd Date: Wed, 10 Jan 2007 07:15:43 -0500
Subject: Re: O'Hare Sighting Cloud Hole Effect - Shough

>From: Michael Tarbell <mtarbell.nul>
>To: ufoupdates.nul
>Date: Mon, 08 Jan 2007 11:07:45 -0700
>Subject: Re: O'Hare Sighting Cloud Hole Effect

>>From: Martin Shough <parcellular.nul>
>>To: <ufoupdates.nul>
>>Date: Sun, 7 Jan 2007 18:30:09 -0000
>>Subject: Re: O'Hare Sighting Cloud Hole Effect


>>I suppose the idea is that when you have very stratified thin
>>cloud of supercooled vapour with clear air above and below,
>>exposed to a discrete and localised infall of relatively large
>>ice crystals from weather processes high above, then this
>>process is laid open to view. So what we are seeing fall out
>>would be the result of natural cloud "seeding". Does this make
>>sense do you think?

>This sounds plausible, although it is sort of 'passing the buck'
>to the upper atmosphere (i.e., we are now left to ponder the
>origin of this localized train of large ice crystals).

Well there has to be some cause. Maybe other cloud holes are
formed in different ways. I suppose if the temperature is close
to the dew point then rising relatively warm air could do it,
but then we're passing the buck downward. What are the
conditions for a thermal updraft that remains as a column or
bubble of rather small horizontal extent at say 10,000 ft?

>Another issue strikes me in the O'Hare case specifically: one
>would think that at relatively low altitudes above the Chicago
>vicinity, the air must be literally _loaded_ with particulate
>matter. Are supercooled states even possible in such an

I don't think anyone was suggesting that this is a mechanism
directly applicable to O'Hare but it's of related interest.


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