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Springfield, Illinois Weather Forecast Discussion

993
FXUS63 KILX 220209
AFDILX

Area Forecast Discussion...Updated National Weather Service Lincoln IL 909 PM CDT Sun Sep 21 2025

.KEY MESSAGES...

- An unsettled pattern continues with periods of showers and storms throughout much of the work week. The highest rain chances are tonight into Monday night (60-80% chance southeast of the IL river tonight and early Mon, and in eastern/SE IL through Monday).

- There is a marginal risk (level 1 of 5) of severe storms through early evening from Canton to Bloomington south. Strong wind gusts are the main concern, although isolated hail up to the size of quarters could also occur.

- Through the end of the work week, the potential for heavy rainfall remains highest south of I-72/Danville where there is a 40-70% chance for total rainfall amounts over 2 inches, and a 20-30% for amounts over 3 inches from I-70 southeast.

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.UPDATE... Issued at 908 PM CDT Sun Sep 21 2025

Only update needed is to pop/wx grids to better reflect reality and expected forecast the rest of the night. Strongest storms have now moved east of I-55 and only rain is left along the interstate and to the west. Update will be out shortly.

Auten

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.DISCUSSION... Issued at 245 PM CDT Sun Sep 21 2025

Isolated showers and thunderstorms have developed in past 1-2 hours from Logan county southward with a more concentrated area of convection between SPI and DEC southward across Christian and western Shelby counties. Isolated showers/thunderstorms had also recently developed north of Peoria and Pontiac. Unstable air mass in place once again with MLCAPES up to 1-2k j/kg and MUCAPES of 1200-2200 j/kg. Moist PW values of 1.4-1.6 inches, while 0-6 km bulk shear values were low, 20-24 kts over central and SE IL.

Surface analysis a mid afternoon shows warm front lifting northward into central parts of MN/WI. SSW to SW winds prevail over central/se IL in warm sector with moist dewpoints in the 60s. Temps had warmed into the 80s over much of CWA with upper 70s from Galesburg to Lacon north. Aloft a 567 decameter low was over NW and west central MN with its trof axis extending southward into eastern parts of NE/KS and OK.

Short waves lifting ne from central/southern MO into central IL during this evening will see more widespread development of convection over CWA from sw to ne, with best chance of convection from I-55 se tonight into Mon morning, and shifting more over eastern/se IL Mon afternoon/evening. SPC has marginal risk of severe storms for damaging winds possible from Canton to Bloomington south into early evening. Small and even large hail up to the size of quarters also a risk too. WPC has marginal risk of excessive rainfall se of the IL river tonight and in southeast IL tonight through Tue night. Have lower convection chances during the day Tue with 30-40% over much of CWA (50% in far se CWA) as we will be between short waves.

A new cutoff low forming over the central plains on Tue to track into IL later Wed and Wed night, and bring more widespread showers and a few thunderstorms to the area from Tue night through Thu. WPC has marginal risk of excessive rainfall from I-72 south with slight risk far se CWA for Wed and Wed night . The LREF shows 40-70% chance of over 2 inches of rain through early Friday from I-72/Danville south with 20-30% chance over 3 inches from I-70 south. Areas nw of Peoria appear to be on the lower end of the rainfall spectrum with half to 1 inch expected, though locally higher amounts possible with thunderstorms. The LPMM shows pockets of rainfall rates of 1-2 inches in less than 6 hours mainly south of I-72 next few days. More clouds and showers around on Monday to keep it cooler despite still being in warm sector with SSW winds, with highs in the upper 70s. A bit warmer Tue in the lower 80s with lower chances of convection. Highs mainly in the mid to upper 70s Wed-Friday and upper 70s/lower 80s Sat/Sunday.

GFS and ECMWF show large upper level trof slowly shifting east of IL late this week, though still close enough on Friday to bring chances of showers especially eastern/se IL. Surface high pressure ridge building into the western Great Lakes and upper Midwest next weekend should return dryer weather to IL while upper level low/trof appears to hang around the southeast states.

The Climate Prediction Center (CPC) 8-14 Day outlook for Sep 29-Oct 5th has a 50-60% chance of above normal temperatures over central and southeast IL and 33-40% chance of below normal precipitation. So the growing season looks to continue through at least early October over the area.

07

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.AVIATION... (For the 00z TAFs through 00z Monday Evening) Issued at 632 PM CDT Sun Sep 21 2025

A large area of showers and storms will move into the area and affect all the TAF sites this evening. HiRes solutions suggests this will definitely affect SPI and DEC, so will have TEMPO groups for those two TAFs. PIA, BMI, and CMI will have PROB30 this evening for now, but as convection evolves over the next couple of hours, TEMPO groups could be added. Cigs and Vis will be VFR, but vis of MVFR will be possible when storms are present. Models show that VCSH will be possible through the rest of the night at all TAF sites until tomorrow morning. Then overcast skies around 6kft will persist tomorrow during the day. Winds will be southwest through the night but become more southerly tomorrow during the day. Wind speeds will be 10kts or less.

Auten

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.ILX WATCHES/WARNINGS/ADVISORIES... None. &&

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NWS ILX Office Area Forecast Discussion

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