Meteorology · Fronts — Warm
Ahead of an advancing warm front, the typical cloud sequence is:
- ACumulonimbus then clear skies
- BCirrus, then cirrostratus, altostratus, and nimbostratus with steady rain✓ Correct
- CFog only
- DScattered fair-weather cumulus
Explanation
A warm front's gently sloping surface produces a lowering, thickening cloud sequence — cirrus to cirrostratus, altostratus, then nimbostratus — with prolonged steady precipitation well ahead of the surface front.
Authority: Bowditch (Pub. No. 9), clouds and fronts
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