Meteorology · Fog — Frontal/Precipitation
Precipitation (frontal) fog typically forms when:
- ARain falling from warmer air aloft evaporates and saturates the cooler air below a front✓ Correct
- BStrong winds mix the lower atmosphere
- CCold dry air subsides over land
- DSea-surface temperature rises sharply
Explanation
Frontal (precipitation) fog forms when rain from warm air above a frontal surface falls into cooler air beneath, raising its dew point until it saturates. It is common ahead of a warm front during steady rain.
Authority: Bowditch (Pub. No. 9), fog
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