Many on social media have been commenting on the moon halo, with it being particularly prominent in Cork. Speaking to the Irish Examiner, Astronomy Ireland said it is caused by ice crystals high in the atmosphere. The ice crystals “bend the light from the Moon at exactly that distance from the Moon”. Alan O'Reilly, from Carlow Weather, told the Examiner that the halo is often seen before a period of low pressure. pic.twitter.com/iL9ja3uVyt — Carlow Weather (@CarlowWeather) March 23, 2021And he might have a point.

Source: Irish Examiner March 23, 2021 22:04 UTC