textproduct: Chicago

KEY MESSAGES

- A stagnant, predominantly precipitation free pattern will prevail through at least mid next week, with seasonably warm daytimes inland, and cooler temperatures closer to the lake.

- Hazardous to dangerous swimming conditions are anticipated at Lake Michigan beaches on Saturday, particularly in Illinois.

DISCUSSION

Issued at 105 PM CDT Fri May 29 2026

The only real item of note for the next few to several days will be another round of dangerous swimming conditions at Lake Michigan beaches on Saturday behind a backdoor cold frontal passage. The large waves and strong currents will be focused onto the Illinois shoreline this time, where a Beach Hazards Statement is in effect from 7 AM to 9 PM Saturday.

Otherwise, persistent western CONUS troughing and northeastern North America troughing will continue to result in a sharp "omega block" type ridge extending into central Canada through midweek next week. At the surface, expansive, seasonably strong high pressure from Hudson Bay to the Great Lakes will result in very little change in daytime temps (seasonable to above average warmth inland though cooler near the lake) and unseasonably low dew points as we transition into meteorological summer. This will also result in several more comfortable overnight-early morning periods outside of Chicago.

Synoptic easterly low level flow will keep better column and low level moisture, and most associated precip chances, west of the MS River. A possible minor exception to this will be late Sunday and especially Sunday night when some spotty showers could sneak into the southwest 1/4 or so of the CWA. The blocking pattern looks to temporarily break down later next workweek. This should set the stage for some threat for showers and thunderstorms in the Thursday night through Friday evening time frame as a cold front pushes across the area. With stronger large scale forcing currently progged to pass well to our north, prospects for widespread beneficial rainfall with the late week front don't look all that promising.

Looking beyond Friday, another similar blocky regime to the current pattern may set up next weekend onward. This will be something to monitor water resources and soil moisture wise, as persistent dryness and strong evapotranspiration this time of year can and has led into rapid onset drought. As such, CPC has highlighted northern IL and southern WI for this in its day 8-14 hazards outlook.

Castro

AVIATION /00Z TAFS THROUGH 06Z SUNDAY/

Issued at 559 PM CDT Fri May 29 2026

VFR conditions expected through the 00z TAF cycle.

Light, mostly easterly winds are expected tonight. A secondary cold front will move across the regional Saturday morning. The only impact will be a slight increase in east northeast winds behind the front, most notable for the terminals closer to Lake Michigan. Otherwise, high clouds (based near 25kft) will continue through the TAF period.

- Izzi/Borchardt

LOT WATCHES/WARNINGS/ADVISORIES

IL...Beach Hazards Statement from Saturday morning through Saturday evening for ILZ006-ILZ103-ILZ104.

IN...None. LM...Small Craft Advisory from 7 AM to 9 PM CDT Saturday for the IL nearshore waters.