ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES …

1 ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES water LEVEL update Jan 28, 2022 WEATHER CONDITIONS Temperatures over the past week were below normal across the GREAT LAKES region. Five-day mean temperatures were 20 or less across the basin, which are eight or more degrees below normal. Seven-day temperature forecasts indicate continued below average temperatures, with maximum temperatures ranging between 15 to 23. Cumulative seven-day precipitation ending January 27th showed the entire basin receiving less than 1 inch.

2 Five-day precipitation forecasts indicate relatively low precipitation, ranging between 0 and inches. lake LEVEL CONDITIONS January 28th forecasted levels are below 2021 levels on all LAKES , except lake Ontario. These water levels are above their long-term average January levels on all LAKES except lake Superior, which is 6 inches lower than its long-term average. A buildup of ice in the St. Clair River is impacting the flow of water into lake St. Clair. Significant fluctuations in water levels are possible as a result.

3 Over the next month, LAKES Superior and Michigan-Huron are expected to continue their seasonal declines and fall by 1-2 inches, whereas lake Ontario and lake St. Clair are forecast to rise 2 and 6 inches respectively. See our Daily Levels web page for more water level information. FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS Predictions indicate lake Superior s outflow through the St. Marys River will be below average in January. Forecasts show lake Michigan-Huron s outflow through St. Clair River and lake St.

4 Clair s outflow into Detroit River will be above average for January. Predictions show lake Erie s outflow into Niagara River will be above average for January and forecasts say lake Ontario s outflow through St. Lawrence River will be above average in January. ALERTS water levels shown are still- water surface elevations over the entire lake surface. water levels at specific locations may differ substantially due to meteorological influences. Official records are based on monthly average water levels and not daily water levels.

5 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 utilize navigation charts and refer to current water level readings. Ice information can be found via the National Ice Center. SUPERIOR MICH-HURON ST. CLAIR ERIE ONTARIO Forecasted water Level for Jan 28, 2022 (feet) Chart Datum (feet) Difference from chart datum (inches)

6 -1 +22 +29 +40 +29 Difference from average water level for Dec 28, 2021 (inches*) -4 -4 -11 -4 +1 Difference from average water level for Jan 28, 2021 (inches*) -13 -18 -17 -7 +12 Difference from long-term monthly average of Jan (inches) -6 +10 +12 +19 +13 Difference from highest monthly average of record for Jan (inches)

7 -20 -27 -25 -14 -11 Year of highest recorded monthly mean 2020 2020 2020 1987 1946 Difference from lowest monthly average of record for Jan (inches) +14 +39 +51 +51 +43 Year of lowest recorded monthly mean 1926 2013 1936 1935 1935 Projected net change in levels by Feb 28, 2022 (inches)

8 -2 -1 +6 0 +2 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, 1918-2020 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 Center for Operational Oceanic Products and Services International Joint Commission Detroit District Home 1-888-694-8313 ext.

9 1 GREAT LAKES Information Network