In the morning hours of April 2nd, a beautiful 22° halo decorated the sky around the Sun. This wonderful optical apparition is caused by refraction of light in ice crystals suspended within high altitude cirrus clouds.
This phenomenon is often associated with the incoming change of weather. Actually, it’s these thin, high clouds that usually precede weather fronts – halos and other optical appearances are merely a side effect. The notion was verified in the evening when a sudden cold front burst in from the north, bringing high winds and some rain but, disappointingly, no lightning.