


Area Forecast Discussion
Issued by NWS Central Illinois
Issued by NWS Central Illinois
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878 FXUS63 KILX 070513 AFDILX Area Forecast Discussion...Updated Aviation National Weather Service Lincoln IL 1213 AM CDT Mon Jul 7 2025 .KEY MESSAGES... - Seasonably hot and humid conditions are expected the next several days, with highs mainly from the mid 80s to around 90, and heat index peaking around 90 to 95 daily. - Occasional periods of scattered showers and thunderstorms can be expected for the upcoming work week. && .DISCUSSION... Issued at 222 PM CDT Sun Jul 6 2025 Lift associated with an upper level shortwave trough and a cold front draped northeast to southwest across central IL have prompted the initiation of scattered showers and thunderstorms this afternoon, which should continue into this evening before diminishing over the area overnight as the front pushes to the south and the shortwave moves to the east. With MLCAPE values of 2000-3000 J/kg but weak shear, a few strong storms containing strong wind gusts could take place, and a SPC has designated a Marginal Risk for severe storms. HREF ensembles continue to advertise very isolated 2-3 inch rainfall accumulations through this evening due to slow storm motion and precipitable water near 2 inches. Isolated instances of flash flooding will need to be watched for, especially if occurring in urban or poor drainage areas. With the front lingering just south of the I-70 corridor Monday, we could see another round of showers and thunderstorms near and south of I-70, then a break should take place Monday night as surface high pressure drifts by to the north, ridging into central IL. A few upper level waves in a weak zonal/westerly flow pattern look to bring chances for more showers and thunderstorms midweek through next weekend. Although timing is far from certain at this point, the first of these looks to work its way slowly across the area late Tuesday through Wednesday, followed by a couple more late week into the weekend. PoPs Wednesday through the weekend depict somewhat of a diurnal trend with highest values during the afternoon to early evening, generally 30 to 50 percent. Severe weather chances look to be generally low, although a few model runs depict a potent enough shortwave for severe weather around Friday. Temperatures look to run seasonably hot and humid for the upcoming week, with highs ranging from mid 80s to around 90, lows from mid 60s to lower 70s, and dewpoints from the 60s to lower 70s, resulting in heat index values peaking around 90 to 95 daily. 37 && .AVIATION... (For the 06z TAFs through 06z Monday Night) Issued at 1213 AM CDT Mon Jul 7 2025 Cloud deck near 1000 feet has been edging southwest into central Illinois, as winds shift to the northeast behind surface boundary. Ensemble guidance shows the lowest ceilings mainly impacting KCMI, and perhaps KDEC/KBMI at times. However, a tongue of low clouds in the guidance extends as far west as KSPI, and ceilings nearby are at 1600 feet, so this seems plausible. Conditions at KSPI/KDEC are expected to improve by 12Z as the cloud tongue pushes southward, though it may take a few more hours to fully clear out in eastern Illinois. By late morning, a clearing trend will be taking place from west to east, with VFR conditions prevailing the remainder of the forecast period. Geelhart && .ILX WATCHES/WARNINGS/ADVISORIES... None. && $$