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Weekly Forecast

ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES WATER LEVEL UPDATE

Apr 12, 2024

 

       

WEATHER CONDITIONS

Temperatures were near average in the Great Lakes basin this past week, with a maximum of 4⁰ Fahrenheit above average. The temperature did increase Monday through Wednesday, average temperatures around 54-60⁰ Fahrenheit. The entire Great Lakes basin received about an inch of rain over the past week. Over the weekend temperatures are expected to fall due to wind and rain coming across the basin. Wisconsin and the western half of Lake Michigan is expected to receive around a quarter inch of rain this weekend. Michigan, New York, and Ohio plus the surrounding lakes are expected to receive around an inch, with some areas in northern Michigan and New York receiving more than 1.5 inches. In the early work week, after the rain continues south, temperatures are expected to warm around the Great Lakes basin, with highs around 70⁰ Fahrenheit during the day.

LAKE LEVEL CONDITIONS

The forecasted April 12th water level for Lake Superior approximates the current level and is an inch above where it was a month ago, while Lakes Michigan-Huron, St. Clair, Erie, and Ontario are 2 to 4 inches above what they were a month ago. All the Lakes are below their levels of a year ago, ranging from 4 to 13 inches lower than last year. Lakes Superior and Ontario are projected to be 1 and 4 inches, respectively, below their long-term April averages. Meanwhile Lake Michigan-Huron, Lake St. Clair and Erie are all predicted to remain above their long-term April averages. Over the next 30 days, water levels are expected to rise on Lakes Superior, Michigan-Huron, St. Clair, and Erie by 1 to 3 inches, while Lake Ontario is projected to climb 5 inches.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Lake Superior’s outflow into the St. Mary’s River is expected to be slightly below average for April.  Lake Michigan-Huron’s outflow through the St. Clair River and Lake St. Clair’s outflow into the Detroit River are projected to be slightly above average for April. Lake Erie’s outflow through the Niagara River, and Lake Ontario’s outflow from the St. Lawrence River are projected to be above average in April.

ALERTS

Water levels shown are still-water surface elevations over the entire lake surface. Water levels at specific locations may differ due to meteorological influences. Official records are based on monthly average water levels and not daily water levels. Great Lakes, connecting channels, and St. Lawrence River users should keep informed of current conditions before undertaking any activities affected by changing water levels. Mariners should use navigation charts and refer to current water level readings. Find ice information at National Ice Center’s website.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Apr 12, 2024 (feet)

601.18

578.90

575.03

572.54

245.37

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+1

+17

+33

+40

+25

Difference from average water level for Mar 12, 2024 (inches*)

+1

+2

+3

+4

+2

Difference from average water level for Apr 12, 2023 (inches*)

-7

-4

-6

-5

-13

 

Difference from long-term monthly average of Apr (inches)

-1

+2

+7

+10

-4

Difference from highest monthly average of record for Apr (inches)

-17

-33

-25

-21

-34

Year of highest recorded monthly mean

1986

2020

2020

2020

1973

Difference from lowest monthly average of record for Apr (inches)

+20

+33

+37

+44

+30

Year of lowest recorded monthly mean

1926

1964

1926

1934

1935

 

Projected net change in levels by May 12, 2024 (inches)

+3

+3

+3

+1

+5

ALL DATA SHOWN IN THIS SUMMARY ARE REFERENCED TO IGLD 1985

*VALUES FOR SPECIFIC DAY ARE BASED ON 3-DAY DAILY AVERAGE AROUND SPECIFIED DATE

LONG TERM AVERAGE PERIOD OF RECORD, 1918-2023

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 – present)

FOR MORE INFORMATION VISIT

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Weekly Great Lakes Water Levels

We do not have the ability to offer email updates at this time.  The Weekly Forecast of Great Lakes Water Levels is updated each week and will be posted by close of business on Friday.

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Detroit District Disclaimer

NOTICE: All data contained herein is preliminary in nature and therefore subject to change. The data is for general information purposes ONLY and SHALL NOT be used in technical applications such as, but not limited to, studies or designs. All critical data should be obtained from and verified by the United States Army Corps of Engineers, Detroit District, Engineering and Construction Division, Hydraulics and Hydrology Branch, 477 Michigan Ave., Detroit, MI 48226. The United States of America assumes no liability for the completeness or accuracy of the data contained herein and any use of such data inconsistent with this disclaimer shall be solely at the risk of the user.