RSS FeedsHydrologic Summary for July 2002 for the Area Served by the NWS Forecast Office at Sioux Falls, SD
Summary
There was no river flooding in the area during July.
Flooding
Flash Flood warnings were issued for the Sioux Falls metro area on the morning of July 10. Two to four inches of rain fell across the city resulting in widespread street flooding, and the collapse of a section of the storm sewer system in central Sioux Falls.
General Hydrologic Information
Temperatures in July were above to much above normal across the region. Most areas recorded average monthly temperatures 3 to 6 degrees above normal. Precipitation for the month varied greatly across the region, but the average was 1 to 2 inches, which is 1 to 2 inches below normal. Some localized totals of 4 to 6 inches were reported.
Stream flows at the end of May were near normal to slightly above normal in the eastern parts of the region. Southeastern and south-central South Dakota, and the immediately adjacent areas of northwest Iowa were reporting stream flows that were 25 to 50 percent of normal. The long term drought indices showed near normal conditions in northwest Iowa and southwest Minnesota, and slightly to moderately dry conditions in South Dakota as of the end of July. The U.S. Drought Monitor has classified all of southeastern South Dakota as D1 (moderate drought), with D2 (severe drought) classifications along the Missouri River in central South Dakota. Soil moisture is below normal (2 to 5 inches) across the region, running at 50 to 75 percent of normal at the end of July. The dry conditions have not persisted long enough to cause any serious water supply problems for the majority of the region yet, but many counties and communities continued to impose water restrictions through the month. Agricultural impacts, particularly to the corn crop, are very significant across eastern South Dakota, and southwest Minnesota and northwest Iowa have seen some impact but not near as severe.
Mike Gillispie
August 13, 2002
August 13, 2002
