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Les Cowley of "Atmospheric Optics" distributes a program called HaloSim. You can simulate halos by controlling several parameters including the crystal shape. Maybe the ray tracing engine could be employed to simulate the halo featured in this thread. [edit to correct spelling]

This is fairly well known fire behaviour in Wildland Urban Interface areas. Here is a discussion about it: http://www.hillsconservationnetwork.org/HillsConservation3/Blog/Entries/2016/5/6_The_truth_about_uban-wildland_interface_fires.html “…destruction in the WUI is primarily the result of the...

In the metric system, only metres and millimetres are used, except the clothing trade which uses cm.... Oh, and it seems radio engineers use cm as well. LOL

The point is that the late 1990's coinage is "a phrase or familiar word used in a new sense". See under "neologism(nɪˈɒləˌdʒɪzəm) or neology"

Are these scars on all the other trees in the parking lot? And are they on the sunny side of the tree?

The main point of posting that data was to rule exhaust contrails in or out on the basis of the ambient temperature. Far too warm, so, Out.

For what they are worth, here are the temperature and humidity soundings around that time (1630 UTC) in the vicinity of Halifax on 23 July 2017. 31000 feet is at 287.4 hPa. Sable Island is off shore to the southeast of Halifax, and Yarmouth is at the west end of the peninsula. The...

Does anyone know what altitude Ethiopian 501 was at over Halifax? The UTC time was 0434 UTC 23 Jul 2017.

I see that I "Liked" this comment in Nov 2016, but now I think that the red line drawn on the ball on the pole is not joining the points of the terminator exactly. One of the points (the lower one) is obscured by the pole, so we can't use that. The line should be tangential to the terminator...

Boeing keep a large stock of spare parts for Airbus planes in Seattle for just this eventuality. pffft

Yes, that is correct. However, in the patent description he never mentions that the water vapor must come to saturation before it will condense on the CCN. He implies that water vapor will condense on CCN, regardless of the state of saturation (which he has instruments to measure - the only...

I haven't read the full description, but from the Abstract, it looks like a wind-up for the chemmies. Question is: why would he bother?

But followers are increasing "exponentially". It's about to reach "critical mass". Nearly. Any time now. ;)

They could also be insects; moths, for instance.

Yes, I do think that logically follows. Maybe the trails of sparse soot and SO2 are too diffuse/dilute, or few relative to the volume available, for trails of ice cloud to be visible.

Well, no. There are two kinds of nuclei. There are Cloud Condensation Nuclei. There are plenty of them and they are everywhere. You cannot get water supersaturated air (in the free atmosphere), that is RHw above 100% because the CCN are always there to initiate condensation. There are Ice...

Even if there is no soot, sulfur, or other introduced ice nuclei, some of the condensation droplets will spontaneously freeze, and there will still be visible contrails and aviation induced cirrus. Ice crystal formation by Homogeneous Freezing (bullet points and a diagram) Ice and Mixed...

The spillway headworks has 8 gates. Then why do we see only 7 plumes in all the photos of the spillway in use? For instance...

See post #456 on page 12. I think those white things are the crests pf breakng waves. I note also that the profile of the (ogee) weir, forming the lip of the emergency spillway, (see photo in post #484 top of this page) is not the same as that shown in the various drawing documents a few pages...

I think those are wave crests that are breaking. They are moving in the same direction as the waves that are not breaking near by.