Updated: Flash Flood Watch Issued for Central Illinois

Weather Blog

Peoria, Ill. (WMBD) – The National Weather Service has issued a Flash Flood Watch for all of Central Illinois through early Monday. Heavy rain is likely to lead instances of flash flooding from Sunday afternoon through Monday morning as powerful storm system moves through the region. A few strong to severe storms are also possible.

Key Takeaways

  • Multiple rounds of heavy rain and storms
  • Widespread 2-4 inches of rain expected, localized amounts over 4 inches possible
  • Flooding and flash flooding likely
  • Strong to severe storms possible, higher chances south

Central Illinois has already received 1-2 inches of rain as of 1 pm Sunday afternoon and more is on the way! Rainfall rates will likely exceed 1 inch an hour at times, especially between 3 pm Sunday and 12 am Monday. Winds will also become gusty Sunday evening with gusts up to 35 mph possible. With heavy rain throughout the day, the combination of saturated soils and gusty winds from the east-northeast could cause a few shallow rooted trees to topple over.

After midnight, the risk of heavy rain will decrease but scattered rain showers will continue. Showers will remain possible through mid-morning before the system pulls away and the rain ends from west to east across the region.

Severe Storm Threat

The Storm Prediction Center (SPC) has placed portions of Central Illinois within a Level 2 Risk (Slight Risk) for severe storms Sunday afternoon and evening. The greatest risk for severe storms is further south in Missouri and southern Illinois where SPC has issued a Level 3 Risk (Enhanced Risk).

This storm system has the makings of a significant severe weather event with damaging winds, large hail and tornadoes (potentially strong) possible with the worst along and south of I-72. While the worst of the storms will likely remain south of the region, isolated to scattered severe storms with hail, damaging winds and tornadoes are possible south of I-74 between 5 pm and 10 pm.

Rainfall Forecast

Most of Central Illinois is expected to receive at least 2-4 inches of rain from Saturday night through Monday with the heaviest rain falling between 6 am Sunday and 12 am Monday. Training thunderstorms with rainfall rates exceeding 1 inch an hour will likely lead to localized areas receiving more than 4 inches of rain. This heavy rain will likely lead to flash flooding and urban flooding. The Weather Prediction Center has issued a “Moderate Risk” for flash flooding through Sunday night.

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