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| LATE THIS AFTERNOON | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  |  |  | | | |  |  |  |  |
| Chance of Showers | Mostly Clear | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers | Mostly Cloudy | Chance of Showers | Chance of Showers |
| Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 75°FHi: 24°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 65°FLo: 18°C |
| POP: 50% | POP: 40% | POP: 60% | POP: 70% | POP: 70% | POP: 70% | POP: 70% | POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 311 PM CDT Sun Sep 13 2026 
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Issued: 230 PM CDT Sun Sep 13 2026
Key Messages
- Waves of heavy rain producing thunderstorms possible in the general region Tuesday through Thursday.
Discussion
... Issued at 230 PM CDT Sun Sep 13 2026
Modest forcing from an axis of mid-level frontogenesis within the right entrance of a 90 knot mid-level jet streak over southern Wisconsin into extreme northern Illinois is supporting a band of rain dragging across northern Illinois early this afternoon. Precip intensity aloft has been strong enough to overcome a fairly dry low-level ai...