Update 11:50AM CDT…
Scattered showers and a few thunderstorms continued late this morning across northern Illinois. The Flash Flood Watch for Winnebago, Lee, Ogle and LaSalle Counties expired.
With a nearly stationary warm from oriented west-east well south of Interstate-80 and occasional eastward-moving upper-level shower/thunderstorm-triggering disturbances rotating across our area, a continued chance of showers/thunderstorms will exist here for at least the next 24 to 36 hours.
Indications are daytime heating combined with another upper-level disturbance could produce a convective complex of strong, possibly severe thunderstorms across central Illinois later this afternoon/evening, spreading north at least to the Interstate-80 corridor (see Storm Prediction Center severe weather outlook map below).
Following are a few more 2-inch-plus rainfall reports this morning…
Latest Storm Prediction Center severe storm outlook…
Update 7:50AM CDT…
Scattered showers and thunderstorms continue this morning, mainly along and south of the Interstate-80 corridor. The Flood Advisory for the far western counties and the Dense Fog Advisory for counties along the Illinois-Indiana Lake Michigan shoreline were dropped earlier this Sunday morning. A Flash Flood Watch for Winnebago, Lee, Ogle and LaSalle Counties continues in effect until 10AM CST.
Heavy rainfall of 2-inches-plus has been reported at many locations – mainly along and south of Interstate-80 with the highest totals thus far 3.32-inches at North Utica and 3.25-inches at Peru. Following are reports in excess of 2-inches…
Update 3PM CDT…
Storms appear to be weakening somewhat as they move east. Most of the Chicago area will be covered with scattered showers and embedded thunderstorms early this Sunday morning. The main problems anticipated are localized possible flood-producing downpours.
A band of strong thunderstorms with potential wind gusts to 50 miles per hour and heavy downpours will move east out of Winnebago, DeKalb, LaSalle and Livingston Counties into southern portions of Boone and McHenry, Kane, Kendall, Grundy and Ford/Iroquois Counties between 2:30 and 3:30AM CDT this Sunday morning.
See latest Regional Weather Radar Mosaic below…