Very wet conditions set up across central and southeast Illinois in April. Figure 1 below shows departure from normal April rainfall. Note a large part of the Midwest and lower Great Lakes saw two to three times normal rainfall. Much of this surplus was the result of a very wet stretch of weather which set up over the area during the middle of the month. An extended period of active spring weather brought well above normal rainfall to all of central and southeast Illinois April 10th through the 19th. Several weather systems impacted the area, with the most significant heavy rain producers on April 10th and April 15th-19th (Figure 2).
Fig. 1. April precip. departure from normal
Fig. 2. April 15-19 rainfall
Fig. 3. April temp. departure from normal
Most of the area picked up 3-7" of rainfall during mid-April, with around 1.30" being a normal amount of rain for that period. The table below lists specific amounts for area cities during this stretch of wet weather.
|April 10-19 Rainfall||Normal||% of Normal|
As a result of this heavy rain falling on saturated soil, sigificant runoff resulted in every river in the area exceeded flood stage. This most significant flooding occured along the Spoon and Illinois rivers, where record crests were observed. The table below lists preliminary record crests set this month.
|Station Name||River||New Record (ft)||Date||Old Record (ft)||Date|
Several daily precipitation records and one monthly "Top 10" were set for the offical climate sites at Peoria, Springfield, and Lincoln. These include:
Links below are the monthly climate summaries for area cities. Only the summaries for Peoria, Springfield and Lincoln are considered "official", meaning they are the station of record for their respective locations. The other summaries are "supplemental", meaning another location in the area is the official climate station for that city.
Climate data for other area cities is available at http://www.nws.noaa.gov/climate/xmacis.php?wfo=ilx