Came across one t'other day. Lots of smoke around from controlled burns, but visibility well over 5000m. Very light wind from the north, maybe 3 or 4 knots. So it's RWY 36, which is the default anyway at YLIL in still conditions.
Despite being VMC, my instructor warned me that it may be difficult to see the threshold of 36 on final - I was glad he told me, because on base it was difficult to even see the field itself looking through the smoke with the sun to the north (despite the ground being clearly visible and horizontal visibility solidly VMC).
We were able to locate the strip with a little difficulty and turn final (although local knowledge came in handy). However, it was not until late final we were able to see the gables marking the runway threshold (and these are quite important when the position of the grass runway itself can vary within the runway strip). Touch and go was uneventful (although uneventful for me at my stage might seem pretty awful for you experienced guys ).
As we took off we looked back and could see 18 perfectly (sun behind us). So, after talking to the others in the circuit we reversed the circuit to use 18 despite the slight tailwind.
I guess the thing that would worry me is a non-radio aircraft inbound - they would see all the indications (smokestacks, lake ripples, etc) of a northerly, even if they overflew they might miss an aircraft in the circuit and the windsock would still clearly suggest 36. So the risk would be that they'd head downwind for 36 and (since all circuits are to the west at YLIL during the day) thus be in direct head-on conflict with other circuit traffic.
With radio, and being able to monitor CTAF, SA would be much better - good argument for radio I guess!
The other lesson for me was that things up there can be quite different to things down here!
Thanks TP for researching this issue - sure got me thinking!:thumb_up: