Fri-Sun, Sept 27-29th Heavy Rain/Flood Event Update #4

Rainfall totals from Friday AM-Saturday AM. (Click)

(11:55AM - 9/28/19) 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 Friday morning through Friday afternoon. Widespread rainfall totals of 0.50-2.00" occurred with this activity across the aforementioned areas, with an isolated corridor of 3-7" totals having occurred along a Peoria to Pontiac axis. A second round of rain and t'storms moved across much of Northern and Central Illinois Friday evening into early this morning. Widespread rainfall totals of 0.50-2.00" occurred with this round of activity, with an isolated corridor of 3-6" totals having occurred for some areas. Combined rainfall totals from the first two rounds of activity Friday morning through Saturday morning were widespread 1-4" across much of Northern and Central Illinois, with an axis of 4-10" totals from the Western Illinois/Iowa border area eastward to the Illinois/Northwest Indiana border area.

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. Rainfall totals with this round should range from 0.25-2.00", with isolated higher amounts possible.

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​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 1-3" across much of Northern and portions of Central Illinois during the aforementioned time-frame. Within this main axis, a corridor of 5-11" rainfall totals are expected, with isolated higher amounts possible. 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...with an axis of major flood potential
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Below is the TAM flood forecast through Sunday afternoon.

​​JP

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