The images in order to show how lake-effect snow occurs are:
- Cold Arctic air moves over warm lake waters.
- Lake surface adds heat and water vapor to cold airmass.
- Water vaper condenses in rising air to form clouds.
- Snow falls over lake and downwind shore.
What is the lake-effect snow
Lake-effect snow occurs is seen as when cold Arctic air passes over warm lake waters. The relatively warmer lake surface transfers heat and moisture to the cold air above. As this moist air rises, it cools, causing water vapor to condense and form clouds.
So, the condensed water vapor falls as snow over the lake and downwind shores. This process is intensified by the temperature difference between the cold air mass and the warmer lake, leading to heavy snowfall in localized areas downwind of the lake.