I received this note from Meteorologist John Dee, with a clarification on the statement above, saying that the "lake effect snow last week pulled even more out of Superior"...
Quote:"Your note on today's (April 11) pasty picture was brought to my attention. While last weeks lake effect snow did originate from the big lake, evaporation is constantly going on and actually occurs at a much higher rate when the temps are warm vs. when the temps are cold. So while the results of the evaporation last week were much more noticeable (in the form of all the snow) the actual evaporation off the lake was smaller than had the temps been warmer, say in the mid 40's as is average for this time of the year. Maximum evaporation off the lakes occur in the summer when the temps are warmest and the least amount of evaporation occurs in the the cold months, even though that is when the evaporation is most noticeable.
Sort of like putting two pots of equal size water on a stove. One gets the heat and the other does not. The pot over the heat will lose it's water due to evaporation much sooner than the one not over the heat. "