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/ Hydraulics and Hydrology / Great Lakes Water Levels / Water Level Forecasts / Weekly Great Lakes Water Levels /
Weekly Great Lakes Water Levels

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Weekly Great Lakes Water Level Update for May 28, 2004

Recent Weather: After a weekend of flooding rains and severe weather, drier conditions arrived in the Great Lakes basin to start the workweek. Significant river flooding is occurring across the Lower Peninsula of Michigan, southern Wisconsin, and northern Illinois as a result of the heavy rain. Many locations are close to or have already set all-time records for total rainfall during the month of May.

Current Lake Levels: Lake Superior is currently 4 inches below its long-term average for May and 2 inches above last year's level. The remaining lakes have increased significantly over the past week due to the extremely wet conditions. Lake Michigan-Huron is now 11 inches above its level of a year ago, but still 11 inches below its long-term average water level for May. Lakes St. Clair and Erie are now above their long-term average for May, and 14 and 8 inches, respectively, above last year's levels. Lake Ontario is currently 4 inches above its long-term average and 2 inches higher than a year ago.

Current Outflows/Channel Conditions: The Lake Superior outflow through the St. Marys River into Lake Huron is expected to be near average during the month of May. Flows in the St. Clair and Detroit Rivers are expected to be below average during May, while Niagara and St. Lawrence River flows are expected to be near average.

Temperature/Precipitation Outlook: Scattered showers and thunderstorms are possible in the Great Lakes basin Friday, as an area of low pressure tracks through the region. A stronger system will push into the basin on Sunday, once again bringing the chance for heavy rain.

Forecasted Water Levels: Excessive rainfall during the past week has caused significant rises on all the lakes except Lake Superior. Lake St. Clair has risen 15 inches over the past month, but it is prone to short-term fluctuations that are often caused by significant rainfall. Over the next month, levels are expected to increase 4 inches on Lakes Superior and Michigan-Huron. Lakes St. Clair, Erie, and Ontario are expected to rise 1 inch over the next month.

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.

Further Information: Please visit the following web sites for more detailed information:

http://www.lre.usace.army.mil/glhh

http://www.ijc.org

http://www.lre.usace.army.mil/Storage/HH/I...ior/index.shtml

http://www.islrbc.org/

http://www.great-lakes.net/envt/water/leve...vels/hydro.html

WATER LEVELS OF THE GREAT LAKES
WEEKLY DATA SUMMARY

Forecasted information provided by:
Department of the Army
Watershed Hydrology Branch
P.O. Box 1027
Detroit, Michigan 48231
(313) 226-6442
Recorded data (1918-PRESENT)provided by:
NOAA, National Ocean Service
SSMC4 Station 7523
1305 East-West Highway
Silver Spring, MD 20910-3233
(301) 713-2902

SUPERIOR
MICH-HURON
ST. CLAIR
ERIE
ONTARIO

Expected water level
for May 28, 2004,in feet
601.3
578.2
574.8
572.0
246.4

Chart datum, in feet
601.1
577.5
572.3
569.2
243.3

Difference from chart datum,in inches
+3
+8
+30
+33
+37

Difference from last month, in inches

+4
+8
+15
+8
+6

Difference from last year,
in inches
+2
+11
+14
+8
+2

.

Difference from long-term monthly average level for May, in inches
-4
-11
+2
+1
+4

Difference from highest recorded monthly mean level for May, in inches

-18
(1986)
-41
(1986)
-25
(1986)
-25
(1986)
-24
(1973)

Difference from lowest recorded monthly mean level for May, in inches
+20
(1926)
+19
(1964)
+30
(1934)
+35
(1934)
+39
(1935)

.

Projected change in levels by June 28, 2004, in inches
+4
+4
+1
+1
+1

ALL DATA SHOWN IN THIS SUMMARY REFERENCED TO IGLD 1985

h2o
 

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Discussion Starter · #2 ·
So Clair is up 14 inch's from last year, and expected to rise 1inch next month.

h2o<--says oh happy day!!!
 
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