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Location: UFOUpDatesList.Com > 2007 > Jan > Jan 9

Re: O'Hare Sighting Cloud Hole Effect - Tarbell

From: Michael Tarbell <mtarbell.nul>
Date: Mon, 08 Jan 2007 11:07:45 -0700
Fwd Date: Tue, 09 Jan 2007 10:33:56 -0500
Subject: Re: O'Hare Sighting Cloud Hole Effect - Tarbell


>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

>>From: Michael Tarbell <mtarbell.nul>
>>To: ufoupdates.nul
>>Date: Sat, 06 Jan 2007 13:38:44 -0700
>>Subject: Re: O'Hare Sighting Cloud Hole Effect

>>>From: Martin Shough <parcellular.nul>
>>>To: <ufoupdates.nul>
>>>Date: Thu, 4 Jan 2007 16:13:15 -0000
>>>Subject: Re: Holes In The Cloud Deck

<snip>

>>I must admit some puzzlement if the mechanism here is the sudden
>>transformation of supercooled water droplets into ice crystals.
>>Such crystals would be less dense and have a higher drag
>>coefficient than water droplets, so there's no obvious reason
>>why they should "rain out", indeed one would guess quite the
>>opposite. If the effect derives from the differing light
>>transmitting properties of ice and water (their indices of
>>refraction are very similar), why do we commonly see high
>>altitude clouds composed entirely of ice crystals that have the
>>same basic appearance as clouds of water droplets?

<snip>

>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).

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
environment?


Mike





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