🔍 Key Concepts
• Weather systems and fog formation – how air stability and moisture create fog
• Differences between high pressure (anticyclones) and low pressure systems
• Typical weather found near fronts (warm fronts vs cold fronts), especially at night
💭 Think About
• Which of these situations usually gives you moist air that is cooled gently and persistently, rather than suddenly?
• In practical marine weather, when do mariners most often report widespread, persistent fog – around highs, lows, warm fronts, or cold fronts?
• Think about wind speed and cloud cover in each option: which setup most favors the surface cooling enough to reach the dew point and form fog?
✅ Before You Answer
• For each choice, ask: does it usually bring stable, light-wind conditions or gusty, changing conditions? Fog prefers the former.
• Recall that rain falling through cooler air ahead of a front can increase humidity and promote fog – which front typically has that pattern?
• Eliminate options that are normally linked with strong vertical mixing and rapid weather changes, which tend to reduce fog, not create it.