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Monthly Water Resource Summary

May, 2019

Precipitation

May 2019 Indiana precipitation was generally well above normal, with average temperature slightly above normal. The statewide monthly precipitation average was 123.1 percent of normal. The overall monthly temperature average for Indiana was 63.1 degrees Fahrenheit or about 1.7 degrees above normal.

All nine of Indiana’s climate divisions received above to well above normal precipitation for the month of May. Climate Division 1 (NW) received the highest (169.7) percentage of normal precipitation for the month, while Division 8 (SC) received the lowest (105.8) percentage. 

For the year to date, all nine climate divisions have received well above normal precipitation, ranging from 128.2 percent of normal for Division 2 (NC) to 147.3 percent of normal for Division 1 (NW).  For the 2019 water year, which began October 1, 2018, total precipitation is above normal for all nine climate divisions (118.6 to 133.4% percent of normal). Beginning January 2018, each of the state’s nine climate divisions have received above normal precipitation. These range from 119.5 percent for Divisions 1 (NW) and 2 (NC) to 132.7 percent for Division 9 (SE).

The Standardized Precipitation Index (SPI) long-term 12-month index shows Climate Division 5 (C), Climate Division 6 (EC), Climate Division 7 (SW), Climate Division 8 (SC), and Climate Division 9 (SE) in the “extremely wet” category; and the remaining climate divisions in the “very wet” category. The 6-month SPI indices shows in the Climate Division 7 (SW) “extremely wet” category; Climate Division 2 (NC) and Climate Division 4 (WC) in the “moderately wet” category; and the remaining climate divisions in the “very wet” category. The 3-month SPI indices shows Climate Division 1 (NW), Climate Division 2 (NC), and Climate Division 3 (NE) in the “very wet” category; and all remaining climate divisions in the “moderately wet” category. The 1-month SPI indices shows Climate Division 1 (NW) in the “very wet” category; Climate Division 2 (NC), Climate Division 3 (NE), and Climate Division 7 (SW) in the “moderately wet” category; and all remaining climate divisions in the “near normal” category.
 

U. S. Drought Monitor

For the period ending May 28, 2019, the U.S. Drought Monitor shows no drought conditions throughout the state. The U.S. Seasonal Drought Outlook does not predict drought conditions through the end of August 2019.

Streamflow

In May 2019, of the twelve streams included in drought reporting since 1999, each had stream flow near to well above normal.  The Muscatatuck River near Deputy had the lowest mean monthly flow at 97%, and the St. Mary’s River at Decatur had the highest mean monthly flow at 483%.

Detailed Information on Streamflow

Lake Michigan

On May 31, 2019, the Lake Michigan-Huron forecasted water level was nine inches above the measurement taken on May 1, 2019, and thirteen inches above the measurement taken on May 31, 2018. On May 31, 2019, the Michigan-Huron level was 581.57 feet, which is 60 inches above the lowest recorded monthly mean level for May set in 1964. Comparison of May monthly mean water levels to the long-term (1918-present) average shows Lakes Michigan-Huron water levels were about 27 inches above the average. All Lake 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 rise about two inches over the next month. 

Reservoirs

On May 31, 2019, the water levels for all eight reservoirs monitored by the U.S. Army Corps of Engineers were above the normal pool elevation. The deviation from normal pool ranged from +0.3 feet (Brookville) to +33.5 feet (J.E. Roush).  

All three reservoirs monitored by Citizens Water were above their respective normal pool elevations as of May 31, 2019. The deviation from normal pools ranged from 0.89 feet (Morse) to 1.09 feet (Eagle Creek).

Groundwater Levels

As of June 2, 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 near normal for Clark 20 and above to well above normal for the remaining wells monitored.

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