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Low Water Supply Conditions Persist on Lake Superior Great Lakes Water Level Information November Precipitation November Outflows
Water Levels for the Great Lakes and Montreal Harbour ... a monthly bulletin from Canadian Hydrographic Service
About the monthly Water Level bulletin
November Precipitation Over the Great Lakes
As a percentage of the long-term November average: Great Lakes Basin 78% Lake Erie (including Lake St. Clair) 104% Lake Superior 49% Lakes Michigan-Huron 84% Lake Ontario 84% Note: These figures are preliminary.
November Outflows From the Great Lakes
As a percentage of the long-term November average: Lake Superior 70% Lake Erie 102% Lake Huron 85% Lake Ontario 120% Note: These figures are preliminary.
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Summary information for "Level News/info-Niveau"

Low Water Supply Conditions Persist on Lake Superior

The water supply to the Lake Superior basin was again below average in November. This was the 10th consecutive month of below-average supplies to that lake. In contrast, the supplies to the basins of lakes Michigan-Huron, Erie and Ontario were all above average for the month.

Even with the dry conditions in the Lake Superior basin, its level only declined by one centimetre more than usual during the month, due to the much lower-than-average outflow from the lake. The level of Lakes Michigan-Huron did not decline as much as usual in November. The much greater-than-average supply to the Lake Erie basin more than offset the less-than-average inflow it received from the upper lakes. This resulted in the total supply to the Lake Erie basin being above average and caused the lake level to rise by one centimetre, rather than decline by four centimetres as it has on average during November. The level for Lake Ontario remained about the same in November, whereas on average it falls by three centimetres in November.

As indicated in the water level information table provided below, the levels of lakes Superior, Michigan-Huron and St. Clair remain below their respective long-term (1918-2005) averages for this time of year. The last time Lake Superior was this low at this time of year was in 1925. The levels of lakes Erie and Ontario are above average for the beginning of December. Only Lake Superior's level is lower than it was a year ago.

It should also be noted that the daily water levels on all lakes except Lake Superior increased a couple of centimetres during the first few days of December in response to the rain that fell throughout the Great Lakes basin during the last few days of November. Although small, these increases did help improve conditions a bit on Lakes Michigan-Huron when compared to December's opening values (provided in the water level information table). Water levels are, however, still expected to continue to decline during December and over the next few months.

Weatheradio Canada

Did you know that Environment Canada has a radio network? Weatheradio Canada is a nationwide network of radio stations broadcasting weather and environmental information 24 hours a day in both official languages directly from Environment Canada's storm prediction centres.

From its inception in 1977, the network has expanded to180 sites across the country, transmitting continuous weather information on seven dedicated frequencies on the VHF public service band. Now, fully 92% of Canadians can access a Weatheradio signal, and recent technological advances have made it possible for listeners to program radio receivers to deliver only certain types of warnings for their specific locations.

For complete information on Weatheradio Canada, please visit Environment Canada's weather Web site and click on the link regarding the radio network, located immediately below the map of Canada.

Season's Greetings

Everyone involved in the preparation and distribution of LEVELnews would like to wish you a happy holiday season and a safe and prosperous new year.

Great Lakes Water Level Information

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