A storm system more typical of late winter tracked across the Midwest on Thursday, May 31st...bringing widespread light to moderate rain to central Illinois. A deepening upper-level disturbance digging southeastward out of the Dakotas triggered the development of surface low pressure over central Missouri early in the day. As the low moved eastward into the Ohio River Valley, rain developed along and north of its track. The heaviest and most persistent rains occurred well to the north along and north of a Canton to Bloomington-Normal line...where amounts around 1 inch were common. Rainfall amounts steadily decreased further south...with many locations along and south of a Vandalia to Robinson line picking up less than one quarter of an inch.
Thanks to everyone who sent in rainfall totals during this event! We had excellent participation from our SWOP network, with multiple reports coming in from communities such as Peoria, Bloomington, and Mattoon.
View the SWOP Rainfall Map - May 31
Below is a rainfall maps from cooperative weather observers from 7 am Thursday May 31 through 7 am Friday June 1.