Meteorology · Clouds
A halo around the Sun or Moon, caused by cirrostratus, often indicates:
- AThat fair weather will persist for a week
- BAn approaching warm front or organized weather system✓ Correct
- CThe immediate onset of a cold front
- DThat a hurricane has already passed
Explanation
Cirrostratus is a thin, high ice-crystal layer that refracts light into a ring (halo). It commonly follows the first cirrus as a warm front or low approaches, often a sign that deteriorating weather is on the way.
Authority: Bowditch (Pub. No. 9)
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