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Weekly Great Lakes Water Levels

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Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

October 31, 2014

 

WEATHER CONDITIONS

Temperatures were slightly above average for much of the basin for the past 7 days with the exception of the early part of the week experiencing daytime highs greater than 10 degrees Fahrenheit above average in several locations.    Precipitation values overall remained close to normal for the week with areas in Northern Michigan and New York receiving over half an inch of rainfall. Monthly precipitation totals for Lake Superior, Michigan-Huron, and Ontario are all above monthly averages with Lake Erie lagging slightly behind the month to date average.

LAKE LEVEL CONDITIONS

Lakes Superior and Michigan-Huron are both 11 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 14 and 7 inches, respectively, above what they were at this time last year while Lake Ontario is 3 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 2 to 3 inches over the next month.  See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Lake Superior’s outflow through the St. Mary’s River is forecasted to be well above average for the month of October.  Lake Michigan-Huron’s outflow into the St. Clair River is predicted to be near average, while Lake St. Clair’s 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 Ontario’s outflow into the St. Lawrence River are projected to be above average in October.

ALERTS

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.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Oct 31, 2014 (feet)

602.66

579.2

574.64

571.49

244.55

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+19

+20

+28

+27

+15

Difference from average water level for Oct 1, 2014 (inches*)

0

+1

-3

-4

-5

Difference from average water level for Oct 31, 2013 (inches*)

+11

+22

+14

+7

-3

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

+7

+4

+7

+5

-3

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

-9

-38

-32

-30

-27

Year of highest recorded monthly mean

1985

1986

1986

1986

1945

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

+23

+33

+35

+35

+28

Year of lowest recorded monthly mean

1925

1964

1934

1934

1934

Projected change in levels by Dec 1, 2014 (inches)

-2

-2

-3

-2

-3

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, 1918-2013

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 – present)

FOR MORE INFORMATION VISIT

Department of the Army

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Detroit District Great Lakes Homepage

Detroit District, Corps of Engineers

NOAA, Great Lakes Online

International Joint Commission

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(301) 713-9596

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1-888-694-8318 ext. 1

 

 

 

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 Technical Services, Great Lakes Hydraulics and Hydrology Office, 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.