Home > Missions > Great Lakes Information > Great Lakes Water Levels > Water Level Forecast > Weekly Great Lakes Water Levels

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 on Thursday afternoon.

Click here for a printer friendly version.

Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

November 21, 2014

 

WEATHER CONDITIONS

Temperatures were near 15 degrees below average for most of the past week across the Great Lakes basin. Temperatures are expected to return to normal over the weekend and into the work week. Cold air and westerly winds contributed to a major snow event in western New York with some areas receiving in excess of 4 feet of snow with a potential for another 2 feet by Friday. Significant snowfall also occurred along the eastern shores of Lake Michigan and Lake Superior. Most of the basin is expected to see normal levels of precipitation in the form of rain through the early part of the week.

LAKE LEVEL CONDITIONS

Lakes Superior and Michigan-Huron are both 10 and 20 inches, respectively, above what they were at this time last year. Lakes St. Clair and Erie are 11 and 7 inches, respectively, above their levels of a year ago while, Lake Ontario is 6 inches below its level of a year ago.  Lakes Superior and Michigan-Huron are both projected to fall 2 inches over the next 30 days.  Lakes St. Clair is projected to rise 1 inch over the next month while Lake Erie is projected to fall 1 inch and Lake Ontario is projected to remain at its current levels. Please note that water levels in Lake St. Clair and Lake Erie were significantly affected by recent weather patterns. 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 November.  Lake Michigan-Huron’s outflow into the St. Clair River is predicted to be above average, and Lake St. Clair’s outflow into the Detroit River is predicted to be above average in November.  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 November.

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 Nov 21, 2014 (feet)

602.53

579.13

574.34

571.36

244.23

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+17

+20

+24

+26

+11

Difference from average water level for Oct 21, 2014 (inches*)

-2

-1

-6

-4

-6

Difference from average water level for Nov 21, 2013 (inches*)

+10

+20

+11

+7

-6

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

+7

+6

+6

+6

-4

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

-9

-34

-30

-28

-29

Year of highest recorded monthly mean

1985

1986

1986

1986

1945

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

+25

+34

+35

+37

+27

Year of lowest recorded monthly mean

1925

1964

1934

1934

1934

Projected change in levels by Dec 21, 2014 (inches)

-2

-2

+1

-1

0

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

provided by

Detroit District Great Lakes Homepage

Detroit District, Corps of Engineers

NOAA, Great Lakes Online

International Joint Commission

Detroit District Home

(301) 713-9596

Great Lakes Information Network

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.