Walked around Herdsman Lake yesterday. It was a typical Perth summer’s day – endless blue sky and not a cloud in sight.
We were out for a walk this morning and noticed that the sun was surrounded by an eerie halo. This uncommon meteorological effect occurs when the sun is shining through ice crystals in high level cloud. The last time we saw a halo like this was in March of last year.
Yesterday evening we went for a walk along the water’s edge at City Beach in Perth. The sun had just set and the western sky looked clear.
But it was a different story in the east, where masses of churning cumulonimbus cloud were glowing orange in the dying rays of the sun. There was obviously something brewing. During the night we had plenty of thunder and lightning, and some heavy downpours as well.
We saw this interesting optical phenomenon around the sun yesterday. It’s called a halo, or 22° halo if you want to be technical. The striking effect is caused by the scattering of light by ice crystals in the high level clouds – probably cirrostratus.
It looks a bit like a huge eye staring ominously down at you from above – like something from a science fiction movie or The Lord of the Rings.