🔍 Key Concepts

• Advection fog and how it forms when warm, moist air moves over colder water • Seasonal changes in Great Lakes water temperature vs air temperature • Which time of year the largest contrast between air temperature and lake water temperature typically occurs

💭 Think About

• Think about when the lake water is still relatively cold, but the air above it is getting warmer and more humid. Which season transition matches that? • Consider when mariners on the Great Lakes most often report widespread fog banks offshore rather than just along the shoreline. • Ask yourself: in which of these periods is the lake water temperature lagging farthest behind the warming of the air?

✅ Before You Answer

• Identify which answer choices correspond to times when air warms faster than the water. • Eliminate any seasons when both air and water are generally very cold, reducing the chance of warm-air-over-cold-water fog offshore. • Focus on the period right after ice-out and snowmelt, when lakes are coldest but the atmosphere is starting to warm.