Weather search

City, ZIP or country

Severe weather

Add to iGoogle

Our severe weather centres

Weather dictionary

Halo

A white or prismatic coloured ring or veil around the sun or moon. To produce this phenomena, the ice crystals must be in a heterogeneous arrangement to refract the sunlight. The most commonly observed is a halo that forms at a 22° radius, although another one at 46° radius may also be seen.

Halo at 22.5°
Halo at 22.5°