Friday, 4 September 2020

August halos from Moravia, Czech Republic

Jiří Kaňovský from Černotín, Czech Republic observed three separate halo complexes this August.

August 2nd, 2020 – bright odd radius halos

I (Jiří Kaňovský) was visiting my aunt when I’ve noticed a halo making cirrostratus cloud shield. It was obvious that what I saw were not classical halos, but odd radii ones. I was able to observe 9°, 18°, 20°, 22°, 23°, 24° and 35° halos. Near the end of the observation, a bright 23° parhelion joined the party.



August 10th, 2020 – classic halos with a twist

These halos were observed due to an extensive cirrus/cirrostratus cumulonimbogenitus shield from a previous thunderstorm activity. At the evening hours, some of the cirrus clouds began to sublimate. Among the classic halos like 22° halo, UTA, CZA, SLA and 22° parhelion, later image stacking revealed a bright spot near supposed 9° column arcs and a 24° halo or a 24° column arc as well.

August 24th, 2020 – almost invisible uppercave Parry

There was a surprise 14 days later in the form of a weak but nice halo complex. A 22° halo, parhelions, weak UTA and CZA were observed. Later image processing revealed a weak uppercave Parry and a hint of a supralateral arc.

All these observations are a part of an endeavour to bring an old project back to life – the Czech HOP (Halo Observation Project). After 10 years of inactivity, multiple people are joining again to work on the project so it could be a place for amateurs and “professionals” alike where they can share their photos of observed complexes.


  1. Impressive displays on 2nd and 10th! These are stacks, correct? I wonder what's going on inside the 35° halo in the first two photos ... could the 28° halo be as clear as that one?

  2. I remember sending observations in from the USA to the Halo Observe Project and remember sending them to an observer named Patrik Trncak

  3. The 28 looks angular, made of 3 segments. Must be some kind of artefact. Wonder what has made it.