Temperatures in the Great Lakes basin have oscillated between above average and below average during the past 7 days. Notable precipitation took place throughout much of the basin last weekend and on Monday. This weekend, temperatures in the region are predicted to be generally above average. These above average temperatures will continue into the early part of the workweek when several cities including Chicago, IL, and Flint, MI, will see temperatures over ten degrees above average on Monday. Rain showers are forecasted for the majority of the basin on Sunday and Monday.
Water Level Conditions:
Lakes Superior and Michigan-Huron are both 10 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 8 and 16 inches, respectively, above what they were at this time last year while Lake Ontario is 2 inches below its level of a year ago. Lakes Superior and Michigan-Huron are both predicted to decline 2 inches over the next 30 days. Lakes St. Clair, Erie and Ontario are projected to fall 3 to 4 inches over the next month.
See the Great Lakes Water Levels web page for more water level information.
Forecasted outflows / channel conditions:
Lake Superiorís outflow through the St. Maryís River is forecasted to be well above average for the month of October. Lake Michigan-Huronís outflow into the St. Clair River is predicted to be near average, while Lake St. Clairís outflow into the Detroit River is predicted to be above average in October. In addition, the outflow of Lake Erie into the Niagara River and Lake Ontarioís outflow into the St. Lawrence River are projected to be above average in October.
Official records are based on monthly average water levels and not daily water levels. Users of the Great Lakes, connecting channels and St. Lawrence River should keep informed of current conditions before undertaking any activities that could be affected by changing water levels. Mariners should utilize navigation charts and refer to current water level readings.