Fri-Sun, Sept 27-29th Heavy Rain/Flood Event

(7:00PM - 9/27/19) The wet pattern that has been in place will continue, with another storm system expected to bring heavy rainfall and flooding concerns to portions of the state, through Sunday morning.

A storm system pushing through the region will bring multiple rounds of rain and t'storms to portions of the state, through Sunday morning. An initial round of rain and t'storms pushed across much of Northern and portions of Central Illinois this morning through this afternoon. Widespread rainfall totals of 0.50-2.00" occurred with this activity across the aforementioned areas, with an isolated corridor of 3-6" having occurred along a Peoria to Pontiac axis.

A second round of rain and t'storms will push across much of Northern and Central Illinois, from evening through Saturday morning. Additional widespread rainfall totals of 1-4" are likely with this activity, with localized higher amounts possible where training of activity is maximized. A third and final round of rain and t'storms will be possible Saturday night through Sunday afternoon, once again across much Northern and portions of Central Illinois.

The repeated rounds of rain and t'storms over the same areas, along with expected training, will allow for widespread rainfall totals of upwards of 2-5" across much of Northern and portions of Central Illinois during the aforementioned time-frame. Isolated corridors of rainfall totals of 5-8" are possible, but will be hard to pin down due to mesoscale factors. Given the wet pattern that has been in place the past several weeks, along with the expected heavy rainfall, low to moderate flood potential will exist across portions of Northern and Central Illinois.
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Below is the TAM flood forecast for this morning through Sunday morning.

​JP

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