Hi Gijs
Just for my understanding, does this still mean when you start in La Paz and
you have no snow in metar the snow-level is set to 3000 meters by default? Or
is there no snow at all?
-Yves
Am 11.08.2012 um 22:39 schrieb Gijs de Rooy <gijsr...@hotmail.com>:
> Hi Stuart,
>
> > That might be worth thinking about, though I suspect it would be
> > rather laborious to do so using property rules.
>
> Well, I did start this in Nasal, but Torsten converted it (incorrectly so it
> seems; but that's not solely his fault) to property rules... :-)
>
> > My main issue with it is that it can result in the snow level moving during
> > a
> > cross-country flight. Some time last year, when there was some snow in
> > Scotland, I found it quite distracting as the snow appear then disappeared
> > seemingly at random as I was flying, depending on whether the nearest
> > airport was reporting snow in their METAR or not.
>
> That sounds like it was caused by the bug I fixed today. Snow should not
> dissapear (except when you fly over some terrain with lower elevation of
> course). The snow level can only get lowered due to a METAR station reporting
> snow at a lower elevation. The system never increases the altitude of the
> snow line. The snow line does not change if a METAR station reports no snow
> (actually "if there is no report of snow"). It simply stays where it was.
>
> When you fly into the range of a new METAR station that reports snow at a
> lower altitude, then you will suddenly see snow appear at lower elevations
> (might be nice to add some time filter for that actually, so it gradually
> lowers). When you fly into the range of another station, the snow level will
> stay the same, or lower even more. But it will never get highered.
>
> You are right that the behaviour I describe here was not seen up to today.
> The snow line was really buggy before I commited today's fix, so please try
> it again. I think you've got a needlessly bad impression of the system.
>
> > Fundamentally, I don't think that the METAR information provides a good
> > enough proxy for the snow level.
>
> METAR can only report snow. It cannot report the absence of snow. And most
> stations don't even report snow in the METAR (you've got SNOWTAMs for that;
> where they give info like snowdepths and braking conditions for each runway).
> So yes, it is only right in very few cases, but that's why I designed the
> system the way it is (supposed to be).
>
> The system only comes in action when there is a pretty good reason to believe
> there is snow. In any other condition; nothing is done.
>
> Cheers,
> Gijs
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