Peoria, Ill. (WMBD) – The final week of April has been off to a great start with above average temperatures and abundant sunshine. However, a slow moving cold front will bring rain and thunderstorms to Central Illinois by Wednesday.
- Periods of thunderstorms between 12 am Wednesday and 12 am Thursday
- Isolated strong to severe thunderstorms possible
- Strong storm threat gradually shifts south throughout the day Wednesday
Storm chances will gradually increase Tuesday night as a low level jet ramps up ahead of an approaching cold front and moisture increases from the south. With dew points reaching the 60s, Wednesday will be a bit muggier than its been. While showers and storms will be possible Tuesday night, the bulk of the rain and will arrive Wednesday afternoon and night.
Tuesday night and Wednesday morning
Strong Storm Timing: 3 am to 10 am
- 1.0″ Diameter Hail
- Locally Heavy Rain
The Storm Prediction Center has issued a Marginal Risk (Level 1 Threat) for much of Central Illinois for isolated strong to severe storms capable of hail up to the size of quarters. Confidence on storm timing and placement is low but there appears to be enough elevated instability and shear for a localized hail threat region wide.
Wednesday afternoon and night
Strong Storm Timing: Noon to 6 pm
- 1.0″ Diameter Hail
- 65 mph Wind Gusts
- Heavy Rain
Periods of showers and thunderstorms will continue throughout the day. While a stray strong storm is possible locally, the focus for strong to severe storms will mainly be south of I-72. The Storm Prediction Center has issued a Marginal Risk (Level 1 Threat) for southern Illinois for isolated severe storms capable of hail, gusty winds and heavy rain.
Storms will be from the southwest to the northeast, parallel to the slow moving front. This could set the stage for training thunderstorms which could lead to locally heavy rain and flash flooding. At this point, the risk for this is highest south of I-72 where 2-3 inches of rain is expected.
The risk of storms will decrease Wednesday night but scattered showers will remain likely through Thursday.
Rainfall amounts will generally range from 0.50″ to 1.50″ along and east of a Macomb to La Salle/Peru line. Further west rainfall amounts will likely remain below a half inch. Locally higher rainfall amounts will be possible where training thunderstorms occur.