Severe storms & heavy rain possible Friday night

Weather Blog

Peoria, Ill. – Another round of strong to severe storms and heavy rain are expected to impact Central Illinois Friday night as a squall line moves out of Iowa and into Illinois.

Summary on Impacts

  • Greatest risk of severe weather is west of a Davenport to Peoria to Clinton line. This area has been placed under a slight risk by the Storm Prediction Center.
  • Storms will be most likely late Friday night/early Saturday morning, mainly between 12 am – 7 am.
  • Damaging wind gusts and flash flooding are the primary threats though isolated tornadoes and hail are possible.
SPC has placed portions of the region in a slight risk for severe storms.

The forecast over the past several weeks seems to play like a broken record. Round after round of storms and heavy rain has lead to near record flooding and made the start of 2019 one of the wettest on record. Unfortunately, as summer officially begins the weather pattern looks to remain wet and stormy, at least through early next week.

Storm Impacts
Central Illinois should wake up to dry conditions Friday morning but will experience an increase in cloud cover as a line of storms moves out of Iowa and Missouri. These storms should move through the region between 10 am and 3 pm. With the best instability south of the region, this line of storms will be on a weakening trend as it moves through. Once the initial line of storms moves through, the remainder of the afternoon should be dry under partly to mostly cloudy skies.

A few lines of showers and storms will move through the region. The main threat of severe weather arrives after midnight.

Additional storms will develop Friday evening in Iowa and should track east along and north of a warm front, arriving in Central Illinois late Friday night as a squall line. A cluster of strong storms may develop ahead of the main line Friday evening. While the exact timing of the line is uncertain, the main window for strong to severe storms is between 12 am and 7 am Friday night/Saturday morning. Damaging wind gusts over 60 mph will be the primary threat though isolated tornadoes are possible along the squall line. While not severe, storm chances will linger through mid-morning Saturday before Summer heat and humidity kick into gear Saturday afternoon.

Rainfall Forecast
Much of Central Illinois received 1-3 inches of rain on Wednesday. This has left the ground saturated and prone to flash flooding, especially if 1-2 inches of rain can fall in an hour or two. With localized rainfall rates of 2-3 inches per hour expected flash flooding is possible, especially along and west of the Illinois River. Widespread rainfall amounts of 1-2 inches are possible along and west of a Kewanee to Peoria to Bloomington line with less further north and east. Of course, locally higher amounts of 2-3.5 inches are possible.

Additional storms are likely Saturday night and Sunday where another 1-2 inches of rain will be possible.

Rainfall forecast through Friday night. Additional rain is possible Saturday night and Sunday.

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