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Sat-Mon, May 16-18th Heavy Rain & Flood Threat Update #1

5/16/2020

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(11:45PM - 5/16/20) The same storm system that will bring the chance for severe t'storms to the state on Sunday, will also bring heavy rain and flood potential to portions of the state as well, through Monday morning.

Synopsis...
Areas of rain and t'storms have been moving across the Central and Southern Illinois this afternoon into tonight, and have now recently overtaken Northern Illinois as well. Upwards of 0.50-3.00" of rain has already fallen across portions of Central and Southern Illinois this afternoon into tonight. 

​Multiples rounds of rain and t'storms will continue to move across the state, through late Sunday night or early Monday morning. This activity will be widespread, with much of the state seeing multiple rounds of activity during this period. Given there will be high atmospheric moisture content for efficient rainfall, repeated rounds of activity, and training potential, a low to moderate flood potential will exist for a large portion of the state. Additionally, for areas across portions of Northeast Illinois that were recently affected by heavy rain and flooding a few days ago, high flood potential will exist across this area given saturated soils and some flooding still ongoing. Final event rainfall totals for this period will be widespread in the range from 1.00-3.00"+ range across much of Central and Southern Illinois, with isolated amounts of 2.00-5.00" being possible. Further north, rainfall totals of 2.00-5.00"+ will be more common across Northeast Illinois and vicinity. Far Western and Northwest Illinois may escape the worse, with more int he range of 0.50-1.50" rainfall totals likely, with locally higher amounts.

Below is the flood and rainfall forecast for this event.
Picture
​​​JP

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