That seems right. They should have asked glider pilots. I note that the paper shows that the latent heat flux is strongly skewed to the native vegetation areas in Dec (soaring season). In August it is the other way, higher over the agricultural areas. I assume latent heat flux means avapoeration.
Peter Champness On Sat, Jun 7, 2014 at 9:03 PM, Gary Stevenson <[email protected]> wrote: > Hi Mike, > > Yeah, I tend to agree with you. This is classic glider lore, that we were > all taught in the cradle. > > Somewhat related are those “impossible” final glides late in the day, > which were achieved by following highly vegetated creek lines. Of course a > big “creek” like the Murray River, gives you more of a sporting chance. > > I “sort of” remember a flight that was done many years ago by our old mate > Noel Roediger, out of Benalla. I think the last turn-point was Shepparton > A/F. Noel used the late evening “lift” off the Broken River, to win the > day. He was in fact the only pilot in the competition to get home that day. > I wonder if Noel remembers that flight? From what I can remember, it should > be etched in his memory forever! My (fallible), memory says that over the > last 50 k or so, Noel achieved a MAX height of around 2000’ AGL. I think > that we can assume that there was a high “pucker factor” involved here, and > no doubt Noel slept well that night! > > > > Gary > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Mike Borgelt > *Sent:* Saturday, 7 June 2014 3:52 PM > *To:* Discussion of issues relating to Soaring in Australia. > *Subject:* Re: [Aus-soaring] Cloud proof fence > > > > Matthew, > > Here's the link to the actual paper. There are others in the research > repository. Search for Lyons,Nair > > http://researchrepository.murdoch.edu.au/4041/ > > > This is a climatological study. > > I think the clouds on any given day over the scrub may be for other > reasons. Particularly late in the day the scrub will trap warmer, moister > air (tree evapo-transpiration - it's what they do) which will become > lighter than the air over the open country nearby at low level leading to > late convection with high based cu. > > Mike > > > > > > > > At 08:08 AM 7/06/2014, you wrote: > > http://www.nytimes.com/2007/08/14/science/earth/14fenc.html > The article is ancient but I thought it was fascinating nonetheless. > > Often I've seen cumulus form over the sunset country but not elsewhere > when flying out of Waikerie or Horsham. Apparently it's not a coincidence. > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > *Borgelt Instruments *- > *design & manufacture of quality soaring instrumentation since 1978 * > www.borgeltinstruments.com > tel: 07 4635 5784 overseas: int+61-7-4635 5784 > mob: 042835 5784 : int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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