Monthly Archives: April 2011

Record-Setting April Rainfall in Illinois

Record-Setting Rainfall [Updated May 2] Based on preliminary data, the statewide average rainfall for April (as of May 2) is 7.59 inches, beating the old record of 7.13 inches set in 1957. Statewide records go back to 1895. Selected Rainfall … Continue reading

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Heavy Rains in Southern Illinois

Heavy rains fell across southern Illinois over the last week. Amounts of 4 to 8 inches were common in areas from Carbondale southward (see map). In addition, heavy rains fell in southern Missouri, southern Indiana, southern Ohio, and large portions … Continue reading

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Severe Weather On April 19, 2011

Thunderstorms moved across Illinois on Tuesday, April 19, 2011, causing widespread damage from tornadoes, hail, and high winds. See map below. In Illinois alone, there were 15 reports of tornadoes – six in Macoupin County, six in Montgomery County, two … Continue reading

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First Half of April in Illinois – Warm

Based on preliminary numbers, the statewide average temperature for the first half of April is 54.0 degrees, 5.4 degrees above the 1971-2000 average. The statewide average rainfall for the first half of April is 1.65 inches, 0.22 inches below average. … Continue reading

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Spring Frost in Illinois

Frost in spring is a concern to farmers, landscapers, and gardeners. Frost in Illinois is usually not measured directly at weather stations. Instead, it is inferred from the air temperature – when the air temperature crosses the threshold of 32°F. … Continue reading

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Tornado Tracks in Illinois 1950-2010

Using data from the NOAA Storm Prediction Center, our GIS specialist Zoe Zaloudek created a map of tornado tracks in Illinois from 1950 to 2010. The tracks are color-coded from blue to red to purple for F0 to F5 tornado … Continue reading

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Soil Temperatures in Illinois

With the arrival of spring, Illinois farmers are monitoring soil temperatures for decisions in the field. And the soil temperatures are on the rise. The ISWS Water and Atmospheric Resources Monitoring (WARM) Program records soil temperatures at 4 and 8 … Continue reading

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