156 FXUS63 KLOT 281715 AFDLOTArea Forecast Discussion National Weather Service Chicago/Romeoville, IL 1215 PM CDT Sun Sep 28 2025
.KEY MESSAGES...
- Dry and unseasonably warm daytime conditions through next week will lead to worsening drought.
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.DISCUSSION... Issued at 233 AM CDT Sun Sep 28 2025
Not much to speak to here as the forecast continues to favor quiet conditions through the period. Early this morning, a zonally- oriented cold front is steadily dropping southward across the CWA. A few northerly gusts to 15-20 mph have been reported immediately behind the front, but otherwise skies remain clear and we`re not even seeing any noteworthy cooling in its wake. Temperatures are sitting in the upper 50s and 60s at the time of this writing.
Today will be a similar story to yesterday, but noticeably cooler for some. Surface high pressure will be centered over the lower Great Lakes today bringing more sunny skies to the region. Most inland areas are forecast to again reach the middle to upper 80s this afternoon. However, onshore flow throughout the day will keep communities near and just inland from the lake a few to several degrees cooler. Lakeside locales will likely fail to make it beyond the lower or middle 70s.
High pressure will dominate the region through the week. Conditions will remain unseasonably warm, especially through Tuesday. Only slightly cooler temperatures are favored for the latter half of the week, but much of the CWA may very well be seeing 80s every day this week. Cooler daytime conditions will continue to be found near the lakeshore for the next several days with persistent onshore flow. Ensemble PoPs are basically zero through the end of the workweek, but dry conditions are highly favored until at least early next week.
Doom
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.AVIATION /18Z TAFS THROUGH 00Z TUESDAY/... Issued at 1215 PM CDT Sun Sep 28 2025
There are no significant aviation forecast concerns anticipated through the period.
Broad surface high pressure will dominate across the Great Lakes region through the forecast period and beyond. Overall, this will result in quiet weather conditions, with little in the way of cloud cover and light surface winds. Accordingly, after a period light and somewhat variable wind directions tonight, expect another afternoon lake breeze to move inland and result in an easterly wind shift at the Chicago area terminals again Monday afternoon.
KJB
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.LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None.
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