Sunny skies and daily high temperatures in the 60's and 70's characterized the weather in the Great Lakes basin last weekend. However, temperatures began falling on Sunday, the skies became overcast, and heavy rain fell in many areas of the basin that day. Temperatures continued dropping through the workweek, as the daily high temperatures on Wednesday were around 30 degrees lower than what they had been during the weekend. Temperatures are expected to rise slightly this weekend, but will remain cooler than average into the coming workweek. Rain showers are predicted in the southwestern and south-central portion of the Great Lakes basin on Saturday.
Lake Level Conditions:
Lakes Superior and Michigan-Huron are 7 and 17 inches, respectively, above what they were at this time last year. Lake St. Clair is 7 inches above its level of a year ago, while Lake Erie is 2 inches below last yearís level. Lake Ontario is 11 inches below its level of a year ago. Lakes Superior and Michigan-Huron are expected to rise 3 inches over the next month. Lakes St. Clair, Erie, and Ontario are projected to rise 4,5, and 7 inches, respectively, during the next 30 days. See the Daily Levels page for more water level information.
Forecasted outflows / channel conditions:
Lake Superiorís outflow through the St. Maryís River is forecasted to be above average for the month of April. Lake Michigan-Huronís outflow into the St. Clair River and Lake St. Clairís outflow into the Detroit River are predicted to be above average in April. The April outflow of Lake Erie into the Niagara River is forecast to be near average, but Lake Ontarioís outflow into the St. Lawrence River is predicted to be less than average in April.
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.
Ice information can be found at the National Ice Center's webpage.