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Monthly Water Resource Summary

September, 2019

Precipitation

September 2019 Indiana precipitation was generally below normal, with average temperature above normal. The statewide monthly precipitation average was 72.6 percent of normal. The overall monthly temperature average for Indiana was 71.3 degrees Fahrenheit or about 6.1 degrees above normal.

Three of Indiana’s nine climate divisions received above normal precipitation for the month of September. Climate Division 8 (SC) received the lowest (5.1) percentage of normal precipitation for the month, while Division 1 (NW) received the highest (222.6) percentage. 

For the year to date, all nine climate divisions have received well above normal precipitation, ranging from 110.1 percent of normal for Division 4 (WC) to 134.6 percent of normal for Division 7 (SW).  For the 2019 water year, which began October 1, 2018, total precipitation is above normal for all nine climate divisions (107.3 to 126.3 percent of normal). Beginning January 2018, each of the state’s nine climate divisions have received above normal precipitation. These range from 113.1 percent for Division 4 (WC) to 129.4 percent for Division 7 (SW).

The Standardized Precipitation Index (SPI) long-term 12-month index shows Climate Division 1 (NW) in the “extremely wet” category; Climate Division 3 (NE), Climate Division 7 (SW) and Climate Division 8 (SC) in the “very wet” category; and the remaining climate divisions in the “moderately wet” category. The 6-month SPI indices shows Climate Division 1 (NW) and Climate Division 3 (NE) in the “very wet” category; Climate Division 2 (NC), Climate Division 7 (SW), and Climate Division 8 (SC) in the “moderately wet” category; and the remaining climate divisions in the “near normal” category. The 3-month SPI indices shows Climate Division 8 (SC) and Climate Division 9 (SE) in the “severely dry” category, and all remaining climate divisions in the “near normal” category. The 1-month SPI indices shows Climate Division 1 (NW) in the “very wet” category; Climate Division 5 (C) in the “moderately dry” category; Climate Division 7 (SW), Climate Division 8 (SC), and Climate Division 9 (SE) in the “extremely dry” category; and all remaining climate divisions in the “near normal” category.

U. S. Drought Monitor

For August 27, 2019, the U.S. Drought Monitor shows Indiana is experiencing "abnormally dry" conditions over much of the north-central and southeast portions of the state. The U.S. Seasonal Drought Outlook predicts no drought conditions for the state through the end of November 2019.

Streamflow

In September 2019, of the twelve streams included in drought reporting since 1999, one had stream flow well above normal, two had stream flow near normal, and nine had stream flow well below normal.  The Muscatatuck River near Deputy had the lowest mean monthly flow at 5%, and the Eel River at North Manchester had the highest mean monthly flow at 131%.

Detailed Information on Streamflow

Lake Michigan

On September 27, 2019, the Lake Michigan-Huron forecasted water level was one inch above the measurement taken on August 27, 2019, and 16 inches above the measurement taken on September 27, 2018. On September 30, 2019, the Michigan-Huron level was 581.66 feet, which is about 60 inches above the lowest recorded monthly mean level for September set in 1964. Comparison of September monthly mean water levels to the long-term (1918-present) average shows Lakes Michigan-Huron water levels were about 30 inches above the average. All Lakes Michigan-Huron data are referenced to the International Great Lakes Datum 1985.

The Lake Michigan-Huron water level is forecast by the U.S. Army Corps of Engineers to decrease by about three inches over the next month.

Reservoirs

On September 30, 2019, the water levels for three of the eight reservoirs monitored by the U.S. Army Corps of Engineers were at or above the normal pool elevation. The deviation from normal pool ranged from -1.9 feet (J.E. Roush) to +5.2 feet (Patoka).  

All three reservoirs monitored by Citizens Water were below their respective normal pool elevations as of September 30, 2019. The deviation from normal pools ranged from -0.11 feet (Morse) to -1.63 feet (Eagle Creek).

Groundwater Levels

As of October 1, 2019 new water level data is available for all of the nine wells currently monitored.  Of the nine wells monitored, data indicates groundwater levels are currently above to well above normal for Lagrange 2, Vigo 7, Posey 3 and Harrison 8. Groundwater levels are below to well below normal for LaPorte 9, Fulton 7, Morgan 4, Randolph 3 and Clark 20. Also, on September 24th, LaPorte 9 recorded a new record low of 8.65 feet below land surface. 

Real-time data are available for all nine observation wells. The real-time information may be accessed on the following U.S. Geological Survey website: http://waterdata.usgs.gov/in/nwis/current/?type=gw

Acknowledgments
This report has been compiled from Division of Water data and from information supplied by the following:

Precipitation data:
National Oceanic and Atmospheric Administration, National Weather Service, Midwestern Regional Climate Center

Standardized Precipitation Index (SPI):
National Drought Mitigation Center (NDMC) and Western Regional Climate Center (WRCC)

Streamflow:
U.S. Geological Survey and State of Indiana cooperative program

Lake Michigan level data:
U.S. Army Corps of Engineers, Detroit District

Reservoir data:
U.S. Army Corps of Engineers, Louisville District

Groundwater level data:
U.S. Geological Survey and State of Indiana cooperative program

Temperature data:
Midwestern Regional Climate Center and Indiana State Climate Office, Purdue University