Meteorology · Fronts — Warm Front Cloud Sequence
As a warm front approaches, which cloud sequence typically precedes it?
- ACumulus building rapidly into a single cumulonimbus
- BCirrus, then cirrostratus, altostratus, and finally nimbostratus with steady rain✓ Correct
- CClear skies followed immediately by fog
- DStratocumulus then clearing
Explanation
Warm air rising gently over the warm-front slope produces a descending, thickening cloud sequence: high cirrus and cirrostratus (often with a halo) first, then altostratus, then nimbostratus with prolonged steady precipitation as the front nears.
Authority: Bowditch (Pub. No. 9), fronts and clouds; WMO
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