textproduct: Chicago

KEY MESSAGES

- An extended period of dry and above to much above average temperatures through the next 7 days.

DISCUSSION

Issued at 142 AM CDT Sun Oct 18 2026

Today looks to be the coolest of the next 7 days with highs in the low to mid 60s. Monday onward high temperatures should be in the upper 60s or 70s each day. No precipitation is expected the next 7+ days with cloudless or nearly cloudless skies many of the days. Gusty southwest winds will develop this afternoon in response to a tightening pressure gradient from deep low pressure tracking across central Canada. In the wake of that system sfc high pressure will become established over the upper Great Lakes/southeast Canada resulting in lighter winds much of the upcoming work week. Weak afternoon lake breezes could bring some modest cooling near the lake in the afternoons. A peek beyond day 7 of the forecast suggests that this pattern could persist the rest of October.

- Izzi

AVIATION /12Z TAFS THROUGH 18Z MONDAY/

Issued at 626 AM CDT Sun Oct 18 2026

Key Aviation Messages for the current TAF period:

- Breezy southwest winds around 20 knots this afternoon

The current TAF window is expected to be fairly quiet: no precipitation and VFR conditions. Winds will remain out of the southwest with wind gusts around 20 knots in the afternoon, potentially occasional gusts to 25 knots closer to KRFD.

DK

LOT WATCHES/WARNINGS/ADVISORIES

IL...Frost Advisory until 8 AM CDT this morning for ILZ023-ILZ032- ILZ033-ILZ039-ILZ108.

IN...Frost Advisory until 8 AM CDT /9 AM EDT/ this morning for INZ001-INZ002-INZ010-INZ011-INZ019.

LM...None.