Why is the ninth month called September?
a phenomenon created when cold dry air passes over a large warmer lake, such as one of the Great Lakes, and picks up moisture and heat
a localized snow falling in convective bands along the lee of lakes when relatively cold air flows over the warm water
In the US, lake-effect snow often occurs on the southern and eastern shores of the Great Lakes during Arctic cold-air outbreaks.
The same effect over bodies of salt water is called ocean effect snow, sea effect snow, or even bay effect snow.