Taken from MPR News article: As DNR climatologist Pete Boulay explains "The DNR uses observers (which can be individuals or groups familiar with the lakes and weather patterns) to report ice outs across the state, and the definition varies from individual to individual. Boulay said there are three main ways to measure an ice out:
- ability to get from point A to point B across a lake;
- when about 90 percent of a lake is ice-free;
- when a lake is completely free of ice.
"We usually leave it in the hands of the locals to declare their ice outs," Boulay said. "
Read the entire article here
Within the article is an interactive map for ice out data on Minnesota Lakes. Click the link below to access the map. Then zoom in to find Long Lake. You can also click a link to see the DNR's data on ice out. Their data is slightly different from ours which is not unexpected as our observers use a definition of "lake completely free of ice".