Meteorology · Thunderstorms — Squall
A line squall approaching a vessel is typically preceded by:
- AA long calm and rising temperature
- BDense fog
- CClear skies and steady wind
- DA roll cloud / dark squall line, sudden wind shift and increase, and a temperature drop✓ Correct
Explanation
A squall line is marked by an arch/roll cloud, an abrupt veering and strengthening of the wind (gust front), a sharp temperature fall, and heavy rain or hail. Mariners reduce sail/secure for the sudden gust.
Authority: Bowditch (Pub. No. 9), thunderstorms and squalls
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