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  • storm clouds over a field

    World Data Centre for Precipitation Chemistry finds a new home at ISWS

    The Illinois State Water Survey is the new home of the World Data Centre for Precipitation Chemistry, which receives and archives precipitation chemistry data and complementary information from stations across the globe.

  • Winter Finally Arrives in Illinois in February

    Snowfall was below average in January, but the statewide precipitation—which includes both rain and melted snow—was 3.9 inches, nearly 2 inches above average, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey at the University of Illinois, Urbana-Champaign.

  • Wind Chill – Serious Science or Hype?

    When the temperature dips below zero and the wind picks up, the wind chill becomes a concern for anyone venturing outdoors.   There are important things to keep in mind about wind chill, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, University of Illinois.

  • Will Illinois have snow for Christmas?

    Illinois State Climatologist Jim Angel wonders if it will be a white Christmas here in Illinois.

  • Wide Range of Weather Hits Illinois This Winter

    The old saying, "if you don't like the weather in Illinois, just wait a minute," was certainly true this winter. Since December 1, Illinois has experienced heavy snows, heavy rains, flooding, and severe weather, including five tornadoes in January. Both precipitation and snowfall totals this winter have been significantly above average for much of the state, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Where is Spring?

    A cold and wet first half of April has farmers still waiting to get into the fields and homeowners waiting to get into their gardens. Temperatures in the first two weeks of April were 4.5 degrees below normal and precipitation was 58 percent above normal. Many places in northern Illinois reported measureable snowfall from an April 5-6 storm, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu).

  • When Will the First Fall Frost Arrive in Illinois?

    While the actual date varies from year to year, Illinois farmers, landscapers, and gardeners anticipate the first fall frost in October, a sure sign that the growing season has ended.

  • Wet Weather Continues for Illinois

    For the fifth time this year, the monthly statewide precipitation has been above average, resulting in the third wettest January-May since 1895, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Wet Weather Challenges the 2008 Growing Season

    Although recent Illinois weather conditions have been ideal for crops, many areas have been affected by late planting and significant flooding across the state, according to State Climatologist Jim Angel of the Illinois State Water Survey.

  • Wettest January-June on Record for Illinois

    Monthly statewide precipitation has been above average every month in the first half of 2008, resulting in the wettest January-June since 1895, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), at the Institute of Natural Resources Sustainability at the University of Illinois.

  • Wettest February Ends Third Wettest Winter

    This past February was the wettest on record in Illinois with statewide records going back to 1895. The 4.48 inches of precipitation was 2.49 inches above average. February is typically one of the driest months of the year, averaging only 1.99 inches, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Wet Soil Conditions in Illinois

    Higher than normal rainfall across most of the state has led to wet soil conditions,  according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program Manager at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • Wet Soil Conditions Continue Throughout Illinois

    Soil conditions throughout Illinois remain wet as most of the state experienced higher than normal rainfall in the first two weeks of July, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program Manager at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • Wet Month Leads to Seventh Wettest Spring for Illinois

    The statewide average rainfall for Illinois in May was 5.6 inches, 1.3 inches above average for the month. Combined with the 2.8 inches in March and 7.3 inches in April, the total rainfall for this spring was 15.7 inches. This is the seventh wettest spring on record since 1895 and 4.3 inches above average, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • Wet June for Illinois

    Statewide June precipitation in Illinois was 5.3 inches, 1.2 inches above normal, and the 25th wettest June on record. The total precipitation for the first half of 2009 was 24.2 inches, 4.8 inches above normal, and the 14th wettest January–June on record for the state, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu).

  • Wet June and Wettest Year-to-Date in Illinois

    The statewide average precipitation for June 2013 in Illinois was 5.2 inches, which is nearly 1 inch above the 1981–2010 average. It was more than double the June 2012 total of 1.8 inches, according to Illinois State Climatologist Jim Angel, at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • water professional measuring well

    Well assessment tool now available for well inspectors

    Sanitarians, drillers, and other professionals who evaluate private well safety can use a new, thorough well assessment tool from the University of Illinois’ Prairie Research Institute (PRI) to better learn how to assist homeowners and identify potential problems with family wells.

  • Welcome new Water Survey staff!

    Since the beginning of the year the Water Survey has hired more than a dozen new people, expanding its capabilities and capacity.

  • Weather was Average for April in Illinois

    Colder temperatures in the first half of April in Illinois were nearly canceled out by warmer temperatures in the second half of the month, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey, University of Illinois.

  • Water Survey to receive $1M for rural outreach programs

    The Illinois State Water Survey (ISWS) will receive more than $1 million in funding through 2021 to support its drinking water outreach programs for private well owners and small, rural communities.

  • Water Survey to analyze flood risks in Peoria County

    The Illinois State Water Survey (ISWS) announced today that new hydrologic and hydraulic modeling of select streams in Peoria County is underway as part of a study to help local communities identify high flood-risk areas for flood mitigation planning.

  • New hydrologic and hydraulic modeling in McHenry County, Illinois is underway.

    Water Survey to analyze flood risks in McHenry County, Illinois

    The Illinois State Water Survey (ISWS) announced today that new hydrologic and hydraulic modeling in McHenry County, Illinois is underway as part of a study to help local communities identify areas of high flood risk for flood mitigation planning.

  • floodwaters covering most of a traffic sign

    Water Survey to analyze flood risks in McDonough County

    The Illinois State Water Survey will be conducting hydrologic and hydraulic modeling in McDonough County, Illinois, as part of a study to help local communities identify areas of high flood risk.

  • Water Survey to analyze flood risks in Massac County, Illinois

    The Illinois State Water Survey (ISWS) announced today that new hydrologic and hydraulic modeling in Massac County, Illinois is underway as part of a study to help local communities identify areas of high flood risk for flood mitigation planning.

  • Water Survey to analyze flood risks in Macoupin County, Illinois

    Illinois State Water Survey (ISWS) hydrologic and hydraulic modeling in Macoupin County, Illinois, is underway as part of a study to help local communities identify areas of high flood risk for flood mitigation planning.

  • Water Survey to analyze flood risks in Bureau County, Illinois

    Illinois State Water Survey (ISWS) hydrologic and hydraulic modeling in the Villages of Tiskilwa and Walnut (Bureau County, Illinois) is underway as part of a study to help local communities identify areas of high flood risk for flood mitigation planning.

  • Water Survey to analyze flood risks in Boone and Winnebago counties

    Illinois State Water Survey (ISWS) hydrologic and hydraulic modeling in Boone and Winnebago Counties, Illinois is underway as part of a study to help local communities identify areas of high flood risk for flood mitigation planning.

  • flooded river

    Water Survey to analyze flood risks along the Wabash River

    The Illinois State Water Survey (announced today that new hydrologic and hydraulic modeling of the Wabash River and select tributaries is underway as part of a study to help local communities identify high flood-risk areas within the Lower Wabash and Middle Wabash-Busseron watersheds for flood mitigation planning in Illinois.

  • Water Survey to analyze flood risks along the Little Wabash River

    The Illinois State Water Survey announced today that new hydrologic and hydraulic modeling of the Little Wabash River is underway as part of a study to help local communities identify areas of high flood risk along the Little Wabash River and its tributaries for flood mitigation planning.

  • TapTalk icon

    Water Survey team launches podcast for drinking water professionals

    The team behind WaterOperator.org and Private Well Class is launching a new podcast to strengthen connections between the many stakeholders involved in ensuring that every American has water that is safe to drink. The first two episodes of Tap Talk: The Drinking Water in Rural America Podcast are available now! 

  • Water Survey simulation of Aug. 12 Gibson City flood

    Water Survey simulation matches progress of Gibson City flood

    A model simulation produced by the Illinois State Water Survey shows the progression of the flood in Gibson City from the morning to the evening of Aug. 12, 2021

  • solar eclipse

    Water Survey researchers tracked weather changes during the eclipse

    An Illinois State Water Survey (ISWS) team documented the eclipse at the Dixon Springs Agricultural Center in Simpson, Illinois, to learn how the atmosphere responded to rapid changes in solar radiation as the moon blocked the sun. At the same time, another team recorded climate conditions every 10 seconds at 19 Illinois locations.

  • Water Survey reports on water demand in Middle Illinois, Kankakee, and Rock River regions

    The Water Survey has published reports on water demand in three water supply planning regions in Illinois: the Middle Illinois (ISWS Contract Report 2018-0), Kankakee (ISWS Contract Report 2019-01), and Rock River (ISWS Contract Report 2019-02) regions.

  • cropped map of Chicagoland water sources

    Water Survey maps complex web of water use in Illinois

    Scientists at the Illinois State Water Survey have developed an interactive map of where every community in Illinois gets its water. Sources include Lake Michigan, rivers and reservoirs, and groundwater.

  • Hideyuki Terashima, Walt Kelly, Katie Buckley, Jennifer Wilson, and Steve Wilson

    Water Survey hosts National Private Well Conference

    The Illinois State Water Survey organized and hosted the 2nd National Private Well Conference May 21-23, 2019 in Harrisburg, Pennsylvania. There were over 120 attendees from 33 states at the event, which featured 25 presentations, a driller's panel, and a dozen 5-minute lightning talks.

  • watershed management areas map

    Water Survey helps Cook County manage stormwater

    Experts from the Illinois State Water Survey support the Metropolitan Water Reclamation District of Greater Chicago in making informed watershed management decisions for a vast service area that includes 128 suburban communities in Cook County. 

  • Water Survey commemorates 125th anniversary

    A series of free half-day seminars will be offered across the state this year to commemorate the Illinois State Water Survey’s 125th anniversary. Seminars will highlight critical water, weather, and climate issues of Illinois. 

  • girl drinking water

    Water Survey analyzes home water supplies

    When Illinoisans with private wells have questions about their home water supply, the Water Survey’s Public Service Lab can provide answers. Our lab can analyze water from any Illinois well, checking for parameters including calcium, magnesium, iron, arsenic, manganese, sodium, hardness, total dissolved solids, alkalinity, color, turbidity, fluoride, chloride, nitrate, and sulfate. 

  • Illinois mp of water supply planning regions.

    Water Supply Planning team helps Illinois meet water needs

    Due to projected growth of the population and economy, Illinois could require 20 to 50 percent more water in coming decades. Ensuring adequate and reliable supplies of clean water for all requires us to think ahead. We need to know how much water will be available, how much water we will need, what the options are for providing additional supplies, reducing demand, and what the impacts and costs will be.

    Since 2006 the Illinois Department of Natural Resources has tasked the Water Survey with leading regional water supply planning activities for 11 Illinois regions. Learn more about the team that carries out this important activity.

  • Warm year in Illinois ends with a cold, dry December

    2017 was the sixth warmest year on record in Illinois with a statewide average temperature of 54.3 degrees, or 2 degrees above normal, in spite of the very cold ending to December.

  • Warm Soils Reported Throughout Illinois

    Soil temperatures rose steadily over the first half of April, increasing 11.5 degrees during the first 15 days. At depths of 4 inches under sod, temperatures averaged 54.9 degrees for the period, 4.4 degrees higher than the long-term average.

  • Warm Soils across Illinois in July

    Soil temperatures at depths of 4 inches under bare soil averaged 79.9 degrees on July 15, 2.1 degrees above the long-term average.

  • Warm October for Illinois

    The statewide average temperature for October was 59.8 degrees, 5.4 degrees above normal, and the on record, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • Warm October across Illinois Ranks among Top Ten

    "With temperatures in Illinois averaging 59.5 degrees, 4.8 degrees above normal, October was the 9th warmest since 1895," says State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Warm November in Illinois

    The statewide average rainfall for October was 1.4 inches, 1.5 inches below normal. This ranks as the 20th driest October on record, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • Warmest Year to Date for the Midwest, Near Normal August

    August 2012 brought relief to much of the Midwest region in the form of near-normal temperatures and much needed rainfall.  No state in the nine-state Midwest region ranked in the top 40 warmest Augusts on record, according to the Midwestern Regional Climate Center (http://mrcc.isws.illinois.edu) at the Illinois State Water Survey (ISWS).  Records date back to 1895.

  • Warmest May on record for Illinois

  • Warmest March on Record for the Midwest

    March was the warmest on record for the nine-state Midwest region, based on preliminary temperature data.  The average temperature for the region was 50.3 degrees Fahrenheit, which breaks the previous record of 46.9 degrees set over 100 years ago in 1910, according to the Midwestern Regional Climate Center (http://mrcc.isws.illinois.edu) at the Illinois State Water Survey (ISWS).

  • Warmest April on Record for Illinois

    Based on preliminary data, the statewide average temperature for Illinois in April was 58.4 degrees, 6.2 degrees above normal and the warmest April on record. This beats the old record of 58.2 degrees set in 1955, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

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    Warmer, wetter winter leaves crop pest picture unclear

    A warmer, wetter winter has caused higher than normal soil temperatures across the state, which could be helping agriculture pests survive the season.