A Nor'easter will bring significant coastal impacts to the Mid-Atlantic and New England through the weekend. Moderate to major coastal flooding, heavy rain, strong winds and high surf expected. Hurricane Nolo is expected to stay just south of the Big Island of Hawaii. However, strong winds and heavy rainfall may bring life-threatening, catastrophic flooding and mudslides through the weekend. Read More >
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| 587 FXUS63 KLOT 252312 AFDLOT Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 612 PM CDT Fri Sep 25 2026 .KEY MESSAGES... - Near to slightly below normal temperatures are forecasted over the next several days. - The next chance for a widespread soaking rainfall won`t come until at least the middle of next week. && .DISCUSSION... Issued at 1244 PM CDT Fri Sep 25 2026 Over the next few days, a deepening coastal low along the northeastern seaboard on the eastern flank of an upper-level ridge over Upper Midwest will reinforce a Rex-like blocking pattern across the Great Lakes. As a result, relatively quiescent conditions will continue across our area through into early next week with no weather concerns of note. Highs will range from the upper 60s to lower 70s, lows will fall to the upper 40s to lower 50s, and winds will remain fairly light (10 mph or less) out of the east. Upper-level shortwaves will meet their demise as they propagate toward the blocked upper- level pattern, leading to occasional periods of mid to upper- level cloud cover and perhaps a few sprinkles particularly through Sunday morning. Toward the middle of next week, a series of waves originating from the northern Pacific region will lead to the development of a more progressive pattern across the CONUS. Ensemble probabilities for soaking rain increase incrementally across much of the central and Midwestern US by the middle of the week as each wave propagates overhead. With that said, will note less clarity on exact details (favored time windows, rainfall amounts, opportunity for thunder) owing to spread on the evolution, speed, and arrival time of each wave. Whether or not the remnants of Pacific hurricane Polo influences the large- scale pattern remains an item of interest, as well. Blended NBM guidance offers broad-brushed change to likely (30-60%) PoPs from Wednesday into the first few days of October, which seems fine for the time being. Borchardt && .AVIATION /00Z TAFS THROUGH 06Z SUNDAY/... Issued at 612 PM CDT Fri Sep 25 2026 There are no significant aviation weather concerns. BKN-OVC clouds around 10 kft will scatter this evening, with SCT-BKN cirrus continuing across the region at times. There is a small potential for some patchy shallow BR, but the signal is too low and isolated to warrant any mention in the TAFs at this time. Light east/northeasterly winds under 10 kts may trend light/variable or light northwesterly late tonight before becoming e/ese again on Saturday. Carlaw && .LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None. && $$ Visit us at weather.gov/chicago |
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