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Weekly Great Lakes Water Levels
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Weekly Great Lakes Water Levels Update for June 28, 2002
Weekly Great Lakes Water Level
Update for November 20, 2009
Weather
Conditions: Above average temperatures
characterized weather conditions across the Great Lakes basin early this week.
An upper level disturbance did bring scattered rain showers to the basin on
Wednesday and Thursday, but precipitation to date in November remains well
below average. The Great lakes basin will likely be dry and sunny with
slightly above average temperatures through the weekend and into Monday and
Tuesday.
Lake Level Conditions: All of the Great Lakes except for Lake Ontario remain several inches
higher than their levels of a year ago. Lakes Superior, Michigan-Huron, St.
Clair and Erie are 3, 11, 4, and 5 inches, respectively, higher than their
levels last year at this time. Lake Ontario is 3 inches below its level of year
ago. The water levels of Lakes Superior and Michigan-Huron are expected to
decline by 3 and 2 inches, respectively, over the next month. Lake St. Clair, Erie and Ontario are expected to decline 2, 1, and 2 inches, respectively, over the next
30 days. Over the next several months, Lake Superior, Lake Michigan-Huron and Lake St. Clair are forecasted to be above their water levels of a year ago. Lakes Erie and Ontario are forecasted to remain near or below last year's levels over the same
time period. See our Daily
Levels web page for more water level information.
Current Outflows/Channel Conditions: In October, the outflow from Lake Superior through the St. Mary's River and the outflow from Lake Michigan-Huron through
the St. Clair River were below average. The flow in the Detroit River was also below average. The Niagara River carried near average flows during October,
while the outflow from Lake Ontario through the St. Lawrence River was above
average in October.
Alerts: 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.
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Forecasted information provided by:
Department of the Army
Detroit District, Corps of Engineers
Detroit
District Home
(313) 226-6442
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Recorded data (1918 – present)
provided by NOAA.
Great
Lakes Online
(301) 713-9596
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For More Information Visit:
Detroit
District Great Lakes Homepage
International Joint
Commission
Great Lakes Information Network
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SUPERIOR
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MICH-HURON
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ST. CLAIR
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ERIE
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ONTARIO
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Expected
water level for November 20 , 2009, in feet
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601.51
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578.28
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573.95
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571.06
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244.32
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Chart
datum, in feet
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601.1
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577.5
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572.3
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569.2
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243.3
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Difference
from Chart Datum, in inches
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+5
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+9
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+20
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+22
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+12
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Difference
from Oct 20, 2009,
in inches*
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0
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0
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-1
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-1
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-4
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Difference
from Nov 20, 2008,
in
inches*
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+3
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+11
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+4
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+5
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-3
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Difference
from long-term monthly average level for
November, in inches
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-5
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-5
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+1
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+3
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-3
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Difference
from highest recorded monthly mean level for November, in
inches
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-22
(1985)
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-44
(1986)
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-35
(1986)
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-31
(1986)
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-28
(1945)
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Difference
from lowest recorded monthly mean level for November, in
inches
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+13
(1925)
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+24
(1964)
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+30
(1934)
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+34
(1934)
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+28
(1934)
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Projected
change in levels
By December
20, 2009,
in
inches
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-3
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-2
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-2
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-1
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-2
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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,
1918-2008
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