Meteorology · Clouds — Indications
The first sign of an approaching warm front or deteriorating weather is often the appearance of:
- AFair-weather cumulus
- BHigh, wispy cirrus thickening to cirrostratus (often with a halo)✓ Correct
- CFog
- DClear skies and a steady barometer
Explanation
High cirrus increasing and merging into cirrostratus (producing a halo around sun or moon), followed by lowering altostratus, classically precedes a warm front and an approaching low-pressure system.
Authority: Bowditch (Pub. No. 9), clouds
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