National Weather Service United States Department of Commerce
September 2022 Hydrologic & Precipitation Summary

Summary:

September 2022 was mainly drier-than-normal across the Upper Mississippi River Valley. Rainfall anomalies ranged from near normal to 4” drier-than-normal across the Upper Mississippi River Valley. Rain totals ranged from 0.29” at Minnesota City Dam 5, MN (COOP) to 5.16” just west of Grand Marsh, WI (CoCoRaHS). The greatest 1-day rainfall was 3.88" near Owen, IA (COOP). This rain fell from 7 AM on September 19 to 7 AM on September 20. 

Several COOP observers’ rainfall totals were among their 10 driest for the month of September. This included Theilman 1SSW, MN which had their driest September with just 0.68” of rain. Their previous record was 0.78” in 1953. Their precipitation records date back to 1938. The following table contains those COOP stations that had one of their driest Septembers.

COOP Stations in which September 2022 was One of Their Driest Septembers

Location

2022 Rainfall

Rank

Driest

Records Began

Minnesota City Dam 5A, MN

0.29”

2nd

0.18” in 1952

1939

Austin Waste Water Treatment Facility, MN

0.60”

6th

0.39” in 1940

1937

Elgin 2 SSW, MN

0.67”

2nd

0.48” in 1979

1939

Theilman 1 SSW, MN

0.68”

1st

Previous Record 0.78” in 1953

1938

Oelwein, IA*

0.75”

7th

0.39” in 1953

1923

Lancaster 4 WSW, WI

0.81”

8th

0.09” in 2004

1893

Charles City, IA

0.82”

8th

0.32” in 1952

1893

Guttenberg Lock & Dam 10, IA

0.91”

10th

0.20” in 1979

1937

Prairie du Chien, WI

0.97”

10th

0.13” in 2004

1893

Fayette, IA

1.00”

6th

0.48” in 1979

1893

* Oelwein 1E and Oelwein 2S were threaded together to extend records back from 2006 to 1923.


No observing sites were among their 10 wettest Septembers.

Flood Conditions:

No flooding was observed.

River Conditions:

During September, there was no river flooding in the La Crosse Hydrologic Service Area (HSA). 

The Mississippi River at La Crosse, WI had an average 7 AM stage of 5.17 feet during the month. This was 0.38 feet below the 1937-2022 long-term average of 5.45 feet. The highest stage was 5.82 feet on September 1 and the lowest stage was 4.85 feet on September 13. This site has not been at or above flood stage (12 feet) since April 13, 2020. This ongoing stretch of 901 days is the 11th longest without reaching the flood stage. It is the longest since a 1,108-day stretch from April 22, 2011, to May 3, 2014 (the 9th longest stretch). The longest stretch was a 3,986-day stretch from May 12, 1954, to April 9, 1965.

Drought:

At the beginning of September 2022, abnormally dry (D0) conditions covered 4.7% of the La Crosse Hydrologic Service Area (HSA). This expanded to 35.1% by the end of the month. At the beginning of the month, it was found in parts of Wabasha County in southeast Minnesota; and Buffalo, Jackson, and Trempealeau counties in west-central and central Wisconsin. By the end of the month, it had expanded south and east into Olmsted and Winona counties in southeast Minnesota; and Clark and La Crosse counties in western Wisconsin. A new area of abnormally dry conditions developed by the end of the month across Allamakee, Clayton, and Fayette counties in northeast Iowa; and Crawford and Grant counties in southwest Wisconsin.

Moderate (D1) drought expanded from just 0.4% (covering just northwest Buffalo County) of the La Crosse HSA to 3.2% (covering northern halves of Wabasha and Buffalo counties) by the end of the month.

During the middle of September, severe (D2) drought was added to northwest Buffalo County and remained there through the remainder of the month. This makes up just 0.2% of the La Crosse HSA.

Precipitation    
Monthly Precipitation Precipitation Departure From Normal