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- When warm rain falls through cooler air, water evaporates from the warm rain. It subsequently condenses in the cool air forming fog. Such fog can be quite dense. It generally will persist as long as the rain continues. Since temperature rises little during the day, there is little diurnal variation in rain induced fog. Improvement in visibility cannot be expected until the rain stops or moves out of the affected area.
NOAA National Weather Service - Cite This Source - This Definition
- Aerosol, Dense Fog Advisory, Evaporation-mixing Fog, Freezing Fog, GF, Ground Fog, Ice Fog, Nieve Penitente, Radiation Fog, Shallow Fog, Steam Fog, Tule Fog, Upslope Fog