Monthly Water Resource Summary

September, 2017

Precipitation

For September 2017, Indiana's precipitation was generally below normal, with average temperature above normal. The statewide monthly precipitation average was approximately 60.5 percent of normal. The overall monthly temperature average for Indiana was 67.5 degrees Fahrenheit or 2.3 degrees above normal.

All nine climate divisions received below normal or well below normal precipitation for the month of September. The southeastern climate division received the highest (97.3) percentage of normal precipitation for the month, while the west-central climate division received the lowest (33.7) percentage.

For the year to date, all of the nine climate divisions have received near normal or above normal precipitation, ranging from 93.8 percent of normal for the southwestern climate division to 126.8 percent of normal for the northeastern climate division.  For the 2017 water year, which began October 1, 2016, total precipitation is above normal for six of the nine climate divisions (86.5% to 118.2% percent of normal). Beginning January 2016, all of the nine climate divisions have received near normal or above normal precipitation. These range from 98.9 percent for the southwestern division to 112.8 percent for the northwest division.

The Standardized Precipitation Index (SPI) long-term 12-month indices shows the northeastern climate division in the very wet category; the northwestern and north-central climate divisions in the "moderately wet" category with the remaining climate divisions in the "near normal" category. The 6-month SPI indices shows the northeastern, central, east-central, and southeastern climate divisions in the "moderately wet" category with the remaining climate divisions in the "near normal" category.  The 3-month SPI indices shows all climate divisions in the "near normal" category. The 1-month SPI indices shows the central, west-central, and southwestern climate divisions in the "moderately dry" category with the remaining climate divisions shown in the "near normal" category.

U. S. Drought Monitor

For the period ending September 26, 2017, the U.S. Drought Monitor shows "moderate drought" conditions in the west-central part of the state and "abnormally dry" conditions in most of the western portions and northern portions of the state.  No other drought conditions exist in the state.  The U.S. Seasonal Drought Outlook predicts drought conditions through December 30, 2017.

Streamflow

Of the twelve streams included in drought reporting since 1999, four had stream flow at normal or well above normal and eight had stream flow below normal or well below normal.  St. Marys River at Deputy had the lowest mean monthly flow at 31%, and the Whitewater River near Alpine had the highest mean monthly flow at 174%.

Detailed Information on Streamflow

Lake Michigan

The Lake Michigan-Huron water level for September 29, 2017 was six inches above the measurement taken on September 29, 2016, and four inches below the measurement taken on August 29, 2017.  On September 30, 2017 the Michigan-Huron level was 580.33 feet, which is approximately 44 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 approximately 17 inches above the average. All Lake Michigan-Huron data are referenced to the International Great Lakes Datum 1985.

The U.S. Army Corps of Engineers predicts the Lake Michigan-Huron water level to fall three inches over the next month.

Reservoirs

The water level for six of the eight Indiana reservoirs being monitored by the U.S. Army Corps of Engineers was below normal pool elevation on September 29, 2017. The normal pool deviation ranged from -1.9 feet (J.E. Roush) to 0.9 feet (Patoka).

Two of the three reservoirs monitored by Citizens Water were below their respective normal pool elevations as of September 28, 2017. The deviation from normal pools ranged from -0.43 feet (Morse) to 0. 01 feet (Geist).

Groundwater Levels

As of October 2, 2017 new water level data was available for eight of the nine wells currently monitored. Data for Harrison 8 is recent as of October 1st. Of the nine wells monitored, data indicate the groundwater levels for La Porte 9, Fulton 7, LaGrange 2, Randolph 3, Harrison 8 and Clark 20 are below their respective mean monthly level. The mean monthly groundwater level is above normal for Vigo 7 and near normal for Morgan 4 and Posey 3. 

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