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Posted by RIZ on 5/15/2008, 10:24 am, in reply to "Magical Mini-Wave"
70.101.15.134
I suspected too that womething was up, and heard a garbled call on the radio "Riz! garble garlbe North of gar4ble garble garble" Lets get the radio fixed in the Grob!, and Ray dont let that stop you! JR
--Previous Message--
: Sorry that I forgot to post this earlier,
: but....last Sunday at Dansville some
: interesting things were going on in the
: atmosphere. After a late start usable
: convection got going, albeit with a low
: (maybe 3800 MSL) cloud base. I noticed that
: there was a fairly small but distinct and
: persistent blue hole over the
: valley....which means there MUST be a wave,
: although not necessarily a soarable one.
: This one was...I was able to get the Grob
: into it and work my way up the sides of the
: clouds in the sunshine to about 5,000 MSL. I
: saw the Pagasus at cloud base on the west
: side of the valley and tried to talk Riz and
: anyone else into it, but unfortunately I
: remained alone. After less than an hour the
: hole filled in, "something"
: changed, and everyone abruptly fell down (me
: too). Then, a couple of hours later, Jari
: got up to something like 6,000 MSL in
: thermals which went up to the
: "new" cloud base. What happened?
:
: The following analysis is (informed)
: speculation. Waves like to form when a
: hydrostatically stable layer is sandwiched
: between two unstable layers. There
: was probably initially a low (~4,000 MSL)
: inversion, likely blown off the relatively
: cold Lake Erie. This provided the stable
: layer for the wave (note that the air above
: cloud base when I had the wave was perfectly
: smooth). Then the wind shifted so that
: Dansville was no longer downstream from the
: lake, i.e. the stable layer was wiped out.
: After a couple of hours, the new air mass
: ripened and allowed convection to go up to
: the new level which Jari later reached. Very
: interesting.
:
: So, for my first flight of the year apart
: from the spring check ride, not bad.
:
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