ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES …

ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES WATER LEVEL UPDATE

Jul 12, 2024

WEATHER CONDITIONS

Over the past week, temperature highs across the Great Lakes Basin were in the lower to upper 80 degrees Fahrenheit.

Chicago, IL and Detroit, MI reached 90 degrees Fahrenheit on July 8th. Most of the region experienced some precipitation

during this week, as remnants from Hurricane Beryl traveled across the basin from southwest to northeast. Heavy rain

cascaded across the southern part of Michigan with some pockets receiving over 5 inches during the storm mid-way through

this week. This caused localized, flash flooding. Over the coming week, temperature highs across the basin are forecast to

remain in the upper 70 to mid to upper 80 degrees Fahrenheit over the weekend and beginning next week. The start of the

weekend is forecast to be dry, with a chance of thunderstorms on Sunday over Lake Superior basin, Michigan, and the Lake

Ontario basins, with accumulations ranging up to a quarter of an inch. Wet weather has a chance of appearing, again, midnext week. The precipitation next week may bring some relief to temperatures mid-to-late next week.

LAKE LEVEL CONDITIONS

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Forecasted water levels for July 12 for Lakes Superior, Michigan-Huron, St. Clair, Erie, and Ontario show that levels have

risen by 5, 4, 4, 1 and 1 inch, respectively, since June 12th. Compared to last year, Lakes Superior and Ontario are 6 and 7

inches lower, respectively, than where they were last year. Lakes Michigan-Huron, St. Clair, and Erie are all within 1 to 2

inches of their levels from last year. Additionally, Lake Superior is near its long-term average for July, and Lake Ontario is

below its monthly long-term average level by 2 inches. Lakes St. Clair and Erie are above their long-term July average by 13

and 11 inches, and Lake Michigan-Huron is above its average by 5 inches. By August 12th, Lake Superior is forecast to rise

1 inch and Lake Michigan-Huron is forecast to be near its current level. Lakes St. Clair, Erie, and Ontario are forecast to

decline by 5, 4, and 3 inches, respectively, over the next month. For more information, please see our water level data web

page.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Lake Superior¡¯s outflow into the St. Marys River is expected to be slightly above average for July. Lake Michigan-Huron¡¯s

outflow through the St. Clair River and Lake St. Clair¡¯s outflow into the Detroit River are projected to be slightly above average

for July. Lake Erie¡¯s outflow through the Niagara River, and Lake Ontario¡¯s outflow from the St. Lawrence River are projected

to be above average in July.

ALERTS

Water levels shown are still-water surface elevations over the entire lake surface. Water levels at specific locations may differ

due to meteorological influences. Official records are based on monthly average water levels and not daily water levels. Great

Lakes, connecting channels, and St. Lawrence River users should keep informed of current conditions before undertaking

any activities affected by changing water levels. Mariners should use navigation charts and refer to current water level

readings.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Jul 12,

2024 (feet)

602.13

579.82

575.98

572.97

245.96

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+12

+28

+44

+45

+32

Difference from average water level

for Jun 12, 2024 (inches*)

+5

+4

+4

+1

+1

Difference from average water level

for Jul 12, 2023 (inches*)

-6

+1

+2

+2

-7

Difference from long-term monthly

average of Jul (inches)

0

+5

+13

+11

-2

Difference from highest monthly

average of record for Jul (inches)

-13

-28

-19

-19

-33

2019

2020

2019

2019

2019

+22

+37

+42

+47

+33

1926

1964

1934

1934

1934

+1

0

-5

-4

-3

Year of highest recorded monthly

mean

Difference from lowest monthly

average of record for Jul (inches)

Year of lowest recorded monthly

mean

Projected net change in levels by

Aug 12, 2024 (inches)

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, 1918-2023

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 ¨C present)

FOR MORE INFORMATION VISIT

Detroit District Great Lakes Homepage

Department of the Army

provided by

International Joint Commission

Detroit District, Corps of Engineers

NOAA Center for Operational Oceanic Products

and Services

Detroit District Home

Great Lakes Information Network

1-888-694-8313 ext. 1

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