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Monthly Water Resource Summary

July, 2019

Precipitation

July 2019 Indiana precipitation was generally below normal, with average temperature above normal. The statewide monthly precipitation average was 86.5 percent of normal. The overall monthly temperature average for Indiana was 76.7 degrees Fahrenheit or about 2.4 degrees above normal.

Three of Indiana's nine climate divisions received above normal precipitation for the month of July. Climate Division 7 (SW) received the highest (120.9) percentage of normal precipitation for the month, while Division 1 (NW) received the lowest (62.0) percentage.

For the year to date, all nine climate divisions have received well above normal precipitation, ranging from 115.5 percent of normal for Division 2 (NC) to 147.7 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 (111.1 to 135.8 percent of normal). Beginning January 2018, each of the state's nine climate divisions have received above normal precipitation. These range from 115.2 percent for Division 1 (NW) to 133.9 percent for Divisions 7 (SW) and 8 (SC).

The Standardized Precipitation Index (SPI) long-term 12-month index shows Climate Division 1 (NW), Climate Division 2 (NC), and Climate Division 4 (WC) in the "very wet" category with the remaining climate divisions in the "extremely wet" category. The 6-month SPI indices shows Climate Division 1 (NW) and Climate Division 2 (NC) in the "moderately wet" category; Climate Division 7 (SW) and Climate Division 8 (SC) in the "extremely wet" category; Climate Division 4 (WC) in the "near normal" category; and the remaining climate divisions in the "very wet" category. The 3-month SPI indices shows Climate Division 7 (SW) in the "very wet" category; Climate Division 3 (NE) and Climate Division 8 (SC) in the "moderately wet" category; and all remaining climate divisions in the "near normal" category. The 1-month SPI indices shows all climate divisions in the "near normal" category.

U. S. Drought Monitor

For July 30, 2019, the U.S. Drought Monitor shows Indiana is experiencing "abnormally dry" conditions over much of the north-central part of the state. The U.S. Seasonal Drought Outlook predicts no drought conditions for the state through the end of October 2019.

Streamflow

In July 2019, of the twelve streams included in drought reporting since 1999, nine had stream flow well above normal, two had stream flow near normal, and one had stream well below normal.  The Muscatatuck River near Deputy had the lowest mean monthly flow at 29%, and the Big Blue River at Shelbyville had the highest mean monthly flow at 171%.

Detailed Information on Streamflow

Lake Michigan

On July 26, 2019, the Lake Michigan-Huron forecasted water level was the same as the measurement taken on June 26, 2019, and fifteen inches above the measurement taken on July 26, 2018. On July 31, 2019, the Michigan-Huron level was 581.91 feet, which is 62 inches above the lowest recorded monthly mean level for July set in 1964. Comparison of July monthly mean water levels to the long-term (1918-present) average shows Lakes Michigan-Huron water levels were about 31 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 one inch over the next month.

Reservoirs

On July 31, 2019, the water levels for all 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 +0.0 feet (Cecil Harden) to +10.0 feet (Patoka). 

All three reservoirs monitored by Citizens Water were above their respective normal pool elevations as of July 31, 2019. The deviation from normal pools ranged from 0.11 feet (Morse) to 0.91 feet (Eagle Creek).

Groundwater Levels

As of July 31, 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, Morgan 4, Randolph 3, Posey 3 and Harrison 8. Groundwater levels are near normal for LaPorte 9 and below to well below normal for Fulton 7 and Clark 20.

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