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"Morning Glory" at YCAB? |
Saturday 08-Aug-09 |
(pics from Kevin Rodda's mobile phone) |
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As Bill Wheatley and
Kevin Rodda turned the Aero Club corner and headed towards the main airfield
gate at around 7.30 am this morning they noticed what appeared to be a "Morning
Glory" type roll cloud approaching from the south east (it looked to be out over
Beachmere). On the basis that it's appearance in the distance resembled a roll
cloud, Kevin commented to Bushy that it would make an interesting photo and made a
mental note to take a shot when we got to the hangar. When they pulled up in front of
Hangar 22 fully two minutes later, Bushy commented ... "you had better move
quickly as it is above us now". To Kevin's surprise, the cloud not only looked like a
Morning Glory roll cloud, it had similar physical and behavioural characteristics to
his memory of the real thing! |
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The pic above was taken
from the apron in front of Hangar 22 under the cloud as it moved across the airfield at an
incredible pace and on towards the the north west. Directly under the narrow but extremely
long cloud the air at ground level was very cold compared to the air immediately in front
of it and immediately behind it. It was also very dark and moist immediately under the
cloud. From their vantage point it stretched to the west way out over Caboolture and
to the east back
across towards Donnybrook. |
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This shot is from
Hangar 21 just after the cloud moved over us (looking back over the garbage tip with the
cloud running roughly parallel to 06-24). |
Another shot from the
front of Hangar 21 showing the cloud stretching back in the distance towards Hazelton
Airfield and Donnybrook. |
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two shots (from adjacent to Hangar 21 but now looking towards the Glasshouse Mountains)
show the solid tube shape starting to break up as it moved further toward the north west. |
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The five pics above were
all taken in a period of only 4 minutes between 7:32 and 7:36. |
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Kevin was fortunate
enough to experience first-hand a few years back the real Morning Glory and
"surf" it in a motorglider as it rolled across Burketown (it normally moves from
north east to south west as it comes in from over the Gulf of Carpenteria). The roll cloud
at Caboolture this morning was remarkably similar. Deception Bay is no Gulf of Carpenteria
... however it really did try very hard this morning! |
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| When the "Caboolture Glory"
continued to move further away from them, Kevin phoned Hans Oerlemans (another CGC member
to have experienced the "Morning Glory" first-hand) to let him know that it was
on track to the Glasshouse Mountains area where he took these fantastic shots
... |
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| Hans estimates that the air mass travelled through at around
20-30 kilometres per hour. It had formed into parallel roll clouds (these are referred to
as "primary", "secondary", "tertiary" etc and are a common
phenomenon with the "Morning Glory"). |
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We later learned that Al Harford (who has been to
Burketown several times to participate in the annual "Morning Glory" season) had
taken the following photo of the same "Caboolture Glory" as it moved past the
Wamuran area. |
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| Tom Claffey also witnessed the "Caboolture Glory" from
the air as it passed over Moreton Island ... |
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Date: Sun, 9 Aug 2009
From: Tom Claffey
Subject: "Morning Glory" type roll cloud at Caboolture Airfield 07-Aug-09
To: "Discussion of issues relating to Soaring in Australia."
Yep,
Saw it on the way into Brisbane early Saturday morning.
Very interesting!
Two lines were swirling around Moreton Bay, never seen the like before.
Tom
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