Protective Intelligence · Week Ahead · No. 4

Chicago Week Ahead Security Brief: September 21–27, 2026

An open-source read on how scheduled events, closures, weather, aviation and police notices constrain movement across the Chicago metropolitan region from Monday 21 to Sunday 27 September. Published on Tuesday 22 September, two days into the window: Monday 21 and Tuesday morning are recorded as outcomes, not forecasts.

CPD issues alerts by district number. Most people know the city by neighborhood, and most of what this brief tracks has an address. The shading counts CPD pattern-alert publications naming each district across the thirty-one days to publication, 22 August to 22 September 2026: 23 counted alerts and 33 district-mentions, because an alert that names more than one district counts in each. The district on each row is the one printed on the alert itself, not on the feed title or the file name; sexual-offense and missing-person alerts are listed in section 05 but excluded from these counts.¹⁴ The closure layer counts distinct permits holding a full street closure active at any point in the window, which is overwhelmingly routine utility and public-way work rather than events.² The located layer plots the venues, festivals, closures, meetings and announced gatherings named in this edition at the addresses their own permits, schedules or agency pages print.^{3, 21} Everything outside the city limits, Medinah, Broadview and Mokena, carries no CPD district and is not on the map.

Every district, the same facts as text

Alert counts are of CPD publications naming the district, not of offenses. A listed district is not a place to avoid. Closure counts are distinct permits holding a full street closure active at some point in the window, grouped by the district each permit row falls in, so a permit that crosses a district line counts in both and the column sums to more than the 684 distinct permits citywide. Two placements on this map sit on a seam and are worth naming: the Hyde Park Jazz Fest permit point resolves to the 2nd although the Midway Plaisance footprint crosses into the 3rd, and the Halsted Street bridge is placed on its geocoded street address in the 9th although the permit’s own point falls in the 12th.^{14, 2, 3}

Ratings score constraint on movement, not danger.

Reading the capacity figures. Every figure below is a venue maximum, not a ticket count, an attendance forecast or a prediction.

Reading the release times. No ballpark, arena or promoter publishes an end time for an event. Where this edition prints a release band it is calculated from the published start: 165 minutes of play plus 30 minutes to clear for baseball, 150 plus 30 for hockey, 180 plus 30 for a concert. Start times are as the source publishes them; the bands are this brief’s own convention.^{7, 23, 8}

Reading the weather line. Temperature, sky and rain are the forecast period’s own values. The gust and thunder figures on each card are the highest value the raw gridpoint carries between 06:00 and 18:00 CDT that day; an overnight hour can be higher and is not shown.^{10, 11}

The day to plan around is Sunday 27. It is the only day of the seven on which through arterials are removed rather than reduced: DuSable Lake Shore Drive is shut in both directions from 06:00 CDT, southbound until 11:30 CDT, Milwaukee Avenue is pedestrianized between Damen and Ashland, the Green Line west branch is still on shuttle buses and the lakefront park roads around Jackson Park are closed with the Drive. Friday is the heavier evening, 95,500 of venue maximum and, on this edition’s release convention, 53,500 clearing together at 22:00 CDT, but Friday removes the most capacity at once, and Sunday removes the road itself.^{2, 1, 3, 7, 8}

128 distinct special-event permits touch the window, 162 rows. 78 of them are single-block, single-day block parties; 114 carry a full street closure; the rest split into 37 festivals, 6 athletic permits, 4 sidewalk sales and 3 farmer’s markets.³ These are counts of permit numbers, not of events: 6 events in the window are filed under more than one permit number, so the event total is lower than 128. Counted as distinct permits with a full closure active on the day, the week runs 13, 11, 13, 12, 21, 94, 34 from Monday to Sunday.² Two of them remove a through route, both on Sunday: the Chicago Fall Half Marathon’s closure of DuSable Lake Shore Drive, and the “Meet Me On Milwaukee” pedestrianization of Milwaukee Avenue between Damen and Ashland. Two standing Loop closures from the State/Lake reconstruction are live every day of the window and are not events.²

Permit records show filings, not street conditions, and they lag emergency work. The map’s closures layer draws all 684 permits holding a full street closure in the window, most of them routine utility and public-way work, and the panel for each district lists every one.²

How this table counts. Every pattern alert the Department published in the thirty-one days to publication is listed. Following this brief’s standing practice, sexual-offense and missing-person alerts are shown but are not counted; 4 sexual-offense alerts fall in the period and are marked (not counted). The counted set is therefore 23 alerts across 14 districts, 33 district-mentions, 19 Community-series and 4 Business-series. The district and the offense type on each row are what is printed on the alert itself, not on the feed title.¹⁴

7 alerts were published after the last edition’s alert window closed on 14 September, and 4 of those were published inside this window itself: burglaries & criminal damage to vehicles in the 1st; motor vehicle thefts in the 14th and 19th; aggravated battery with a firearm in the 8th; motor vehicle thefts in the 1st. 7 counted alerts are robbery-classified by the type printed on them. The 2nd District carries 4 counted alerts and the 1st, 8th, 14th, 16th, 17th and 19th carry 3 each. Alert volume measures how often the Department publishes a notice, not how much crime occurred.¹⁴

Shaded rows involve robbery. Rows marked (not counted) are sexual-offense alerts: they are listed because the Department published them in the period and excluded from every count in this edition, including the map shading. Their CPD record numbers are not reproduced. An alert stays listed until CPD removes it, so a listing does not mean an incident is ongoing. Suspect photographs and descriptions are never reproduced here; the CPD page carries them.¹⁴

Six announced gatherings inside the city carry a citable source in this window. None holds a street-closure permit, and no source states a size for any of them. Four of the six exist on one aggregator only and name no organizer, and are marked SINGLE-SOURCE.^{26, 27, 28}

Announced outside the City of Chicago

Four further announced gatherings fall outside the city limits and carry no CPD district, so none is on the map. A candlelight vigil at the ICE processing facility at 1930 Beach Street, Broadview, on Saturday 26 at 18:00 CDT, billed as a one-year anniversary, with no organizer named and no size stated. And three announced protests naming the President at Medinah Road and Irving Park Road and at Lake Street, DuPage County, on Thursday 24 at 10:00 CDT, Saturday 26 from 10:30 to 11:30 CDT and Sunday 27 at 15:00 CDT. No organizer is named for any of the four and none is corroborated elsewhere; sizes are not stated. SINGLE-SOURCE.²⁶

The Presidents Cup, Medinah Country Club

The organizer’s own site gives the dates as “September 22-27, 2026” at Medinah Country Club.³⁸ Medinah is in DuPage County, outside the City of Chicago, and carries no CPD district. The FAA temporary flight restriction list carried 91 restrictions at the 14:03 CDT Tuesday pull, 4 of them VIP, in Virginia, New York (two) and Texas, although the Texas row is a standing record last modified in 2015 and carries no dates. There is no VIP restriction anywhere in Illinois. The single Illinois entry is a hazards restriction at Trivoli, dated Monday 28 September and stamped UTC on the row, outside this window and in central Illinois rather than the Chicago area.³⁹ This edition states the tournament dates and infers no itinerary.

Note on unpermitted assembly

Where this brief notes that a gathering is unpermitted, that is a statement about data availability and nothing else. Peaceful assembly and protest are protected activity. TB Defense reports gatherings solely because they affect how long it takes to move through a street, and takes no position on the subject, organizers or participants.

What has changed in the public record between the 14 September edition and this one. Nothing here changes a rating in Section 02.

New alerts

7 CPD pattern alerts have been published since the last edition’s alert window closed on 14 September: burglaries & criminal damage to vehicles in the 1st (22 Sep); motor vehicle thefts in the 14th and 19th (22 Sep); aggravated battery with a firearm in the 8th (22 Sep); motor vehicle thefts in the 1st (21 Sep); armed robberies in the 18th (20 Sep); brown line robberies in the 1st (16 Sep); criminal sexual abuse in the 1st (15 Sep, not counted).¹⁴

A withdrawn and re-issued alert

P26-3-028, the 19th District scooter-theft alert published 29 August, is no longer in the CPD feed. The same pattern has been re-issued as 26-CWP-025, with a district set widened from the 19th alone to the 14th and 19th. The withdrawn document still resolves at its original address.¹⁴

Ended closures

The Canal Street full closure on the Union Station frontage expired at 23:59 CDT on Monday 21 and does not recur. Anshe Emet’s High Holy Days closure on West Grace Street and North Pine Grove Avenue lapsed the same night. Retro on Roscoe’s 6 full closures on Roscoe Street and its side streets ran to 06:00 CDT Monday.^{2, 3, 30}

Continuing, not extended

Both lakefront products were reissued on Tuesday afternoon, the Beach Hazards Statement at 14:48 CDT and the Small Craft Advisory at 14:46 CDT, and both still carry an end time of Wednesday 23 at 19:00 CDT, unchanged from the copies read at 14:07 CDT the same day.^{12, 13}

Gone from the calendar

Riot Fest, Old Town Oktoberfest, the Race to Wrigley and the Chicago River Swim all ended by 06:00 CDT on Monday 21. McCormick Place is dark for the whole window: IMTS finished at 17:00 CDT on 19 September on the calendar’s own end time, and the next booking is 30 September.^{16, 30}

No WARN separation date falls inside this window anywhere in Cook, DuPage, Lake, Will, Kane, McHenry or Kendall County: zero initial notices and zero supplemental notices, computed across the June, July and August 2026 monthly reports.²⁰ No September 2026 workbook has been filed; the archive’s newest row is still “Aug 31, 2026 WARN”.

The nearest dated separations sit either side of the window. Two Will County closings carry “or within 14 days after” tails that ran out on 18 and 20 September, the days before the window opened; the workbooks do not record whether either slipped. Separately, three Will County filings schedule 185 September separations by month rather than by date, so none of them can be placed inside or outside these seven days. In the thirty days after the window, 28 September to 27 October, 9 initial notices dated by their first layoff date cover 1,229 workers, and 4 supplemental notices whose stated additional-layoff dates fall in the same range add 462 more: Capital One 431, Heartland Human Care Services (SAFEty Admin) 21, Heartland Human Care Services 9, SMBC MANUBANK 1.²⁰ All 9 initial notices in the seven counties are below.

Where the supplemental notices land

The two Chicago addresses in the supplemental notices are 4822 N. Broadway Ave (20th District, 21 workers) and 5715 W. Belmont (25th District, 9 workers). Capital One’s is in Riverwoods, Lake County, and SMBC MANUBANK’s in Naperville. A WARN notice is a required employment disclosure. It marks where a number of people meet a known event on a known date.²⁰

Counts and causes

Counts and causes are as the employer filed them. Nothing in a WARN filing describes conduct, and nothing here suggests any named employer or workforce presents a risk.

Is DuSable Lake Shore Drive closed the week of September 21, 2026?

Yes, on Sunday 27 September, in both directions. Northbound is closed from 67th Street to the McCormick Place building from 06:00 to 10:00 CDT and southbound from 31st Street to 67th Street from 06:00 to 11:30 CDT, for the Chicago Fall Half Marathon & 5K. The permit’s own row extent is 2450 S to 6244 S DuSable Lake Shore Drive, about 4.7 miles, and the southbound segment it describes runs about 4.5 miles. The 31st Street bridge stays open to general traffic for access to Soldier Field, and 57th, Cornell, Marquette and Hayes Drives in Jackson Park close alongside it. No other full closure of the Drive falls in the window.

What is the worst window for movement in Chicago the week of September 21, 2026?

Friday 25 September, 21:25 to 22:30 CDT. Rate Field clears first, a venue maximum of 42,000 onto the Red Line at Sox-35th and onto the Dan Ryan; 35 minutes later the United Center and Huntington Bank Pavilion release together, a combined venue maximum of 53,500, with the Pavilion’s walk-off feeding Roosevelt on the same Red Line. Release times are calculated from published start times on this brief’s own convention, 165 minutes plus 30 to clear for baseball and 180 plus 30 for a concert, because no venue publishes an end time. The United Center’s share discharges into a West Loop where the Jerk Fest permit holds full closures of Randolph, Warren and Washington at 1500 West, 0.47 mi away, and the Randolph Street Market permit holds a full closure of Ada Street 0.70 mi away. Saturday carries the same 95,500 of venue maximum but staggers its three releases across three hours.

Which streets are closed for events in Chicago, September 21 to 27, 2026?

128 special-event permits touch the window and 114 of them carry a full street closure, but 78 are single-block, single-day block parties. The ones worth routing around are Randolph, Warren and Washington at 1500 West for the Jerk, Seafood & Vegan Fest; Ada Street from Friday 05:00 CDT to Sunday 22:00 CDT for the Randolph Street Market; North Clark Street 3450 to 3600 from Friday 22:00 CDT to Monday 06:00 CDT for Clark Street Live; South Halsted Street 1800 to 2025 in Pilsen from Thursday 22:00 CDT for Sabor Fest; East Midway Plaisance from Saturday 04:00 CDT for the Hyde Park Jazz Fest; and on Sunday both DuSable Lake Shore Drive and Milwaukee Avenue between Damen and Ashland. In the Loop, Lake Street between Dearborn and Wabash and southbound State Street between Wacker and Randolph are closed every day for the State/Lake reconstruction.

Is the Green Line running the weekend of September 26, 2026?

Not west of Ashland. Shuttle buses replace Green Line trains between Laramie and Ashland from Saturday 26 September at 04:30 CDT to Monday 28 September at 04:00 CDT, for station and structural maintenance. Trains run Harlem to Laramie and Ashland to Ashland/63rd and Cottage Grove, and the shuttles make courtesy stops on Washington and Warren between Cicero and Damen. Ashland is 0.46 mi from the United Center and is the nearest station to both West Loop festivals. Separately, 63rd-bound and Cottage Grove-bound trains skip 43rd from Saturday 04:00 CDT.

Will weather delay flights at O’Hare or Midway the week of September 21, 2026?

Nothing in the forecast suggests so. Neither airport appeared in any ground stop, ground delay program, delay or closure list in the FAA’s airport-status file when it was read at 14:02 CDT on Tuesday 22 September, and the file carried no ground-stop list at all; the delay programs it did list were at Boston and San Francisco. The Chicago forecast carries a slight chance of rain showers on Wednesday at 16 percent and is dry from Thursday onward, with a probability of thunder, across the daylight hours, of 0 percent Wednesday through Saturday and 4 percent on Sunday. Airport status is a moment-in-time reading and changes within the hour.

How many CPD pattern alerts are open in Chicago in September 2026?

23 counted community and business pattern alerts were published between 22 August and 22 September 2026, across 14 districts. 4 further sexual-offense alerts are listed in section 05 but are not counted, following this brief’s standing practice. 7 of the counted alerts are robbery-classified by the offense type printed on the alert and 7 name more than one district. The 2nd District carries 4 and the 1st, 8th, 14th, 16th, 17th and 19th carry 3 each. 4 were published inside this window: burglaries & criminal damage to vehicles in the 1st; motor vehicle thefts in the 14th and 19th; aggravated battery with a firearm in the 8th; motor vehicle thefts in the 1st. An alert count measures how often the Department publishes a notice, not how much crime occurred.

What is the Chicago weather forecast for September 21 to 27, 2026?

Cool and getting calmer, with a slight chance of rain showers on Wednesday and dry days after it. Highs of 64 on Wednesday, 66 Thursday, 64 Friday, 66 Saturday and 67 Sunday, with overnight lows of 56 to 57, under mostly sunny skies Thursday through Saturday, mostly cloudy skies on Sunday, and showers giving way to mostly cloudy on Wednesday. Gusts over the daylight hours, 06:00 to 18:00 CDT, fall steadily from 21 mph on Wednesday to 7 mph on Sunday, and the gridpoint carries no heat-index value at any hour of the week. Two lakefront products run to 19:00 CDT on Wednesday 23: a Beach Hazards Statement for Lake, Northern Cook and Central Cook Counties with waves of 4 to 7 feet, and a Small Craft Advisory for the Illinois nearshore waters from Winthrop Harbor to Calumet Harbor. The exposure at Saturday’s and Sunday’s early start lines is cold, not heat, wind or lightning.

Is there a Bears game or a convention in Chicago the week of September 21, 2026?

No. Soldier Field lists no event between 21 and 27 September; the earliest on its own all-events page is 28 September, which covers both the Bears and the Chicago Fire FC home schedules. McCormick Place is dark for the whole window: its calendar service returns 11 events between 1 September and 15 November and not one falls inside these seven days. IMTS finished at 17:00 CDT on 19 September and the next booking is 30 September. Neither Wintrust Arena nor Allstate Arena has a date in the window.

Which police district is the West Loop in?

The 12th District, Near West, which also covers Fulton Market, Greektown, Little Italy, University Village, Pilsen and the Illinois Medical District. It carries the United Center, the Jerk Fest and Randolph Street Market footprints, Sabor Fest, the St. Helen Carnival and the Consulate General of Mexico, and it is named in 2 of the 23 counted CPD pattern alerts published in the thirty-one days to 22 September 2026.

When does Sukkot begin in Chicago in 2026?

At sunset on Friday, 25 September 2026. Candle lighting in Chicago is 18:24 CDT for Erev Sukkot, which coincides with Erev Shabbat that year. Sukkot I candle lighting is 19:22 CDT on Saturday and Sukkot II ends at 19:20 CDT on Sunday. The intermediate days run 28 September to 1 October, outside this window.

Are there WARN layoffs in the Chicago area the week of September 21, 2026?

No WARN separation date falls inside the window anywhere in Cook, DuPage, Lake, Will, Kane, McHenry or Kendall County. In the thirty days after it, 28 September to 27 October, 9 initial notices dated by their first layoff date cover 1,229 workers, and 4 supplemental notices add 462 more. The largest single separation is 510 at a Lincolnshire wholesaler on 3 October. No September 2026 monthly workbook has been filed yet.

Low

Movement is close to normal. Nothing in the domain removes a route, fills a corridor, or changes staffing.

Moderate

Movement is constrained in known windows. Plan around published start and end times and the constraint disappears.

High

Movement is constrained in a way that timing alone cannot solve. A route is removed, two large crowds release into the same roads inside an hour, or a date carries symbolic weight that changes institutional demand.

Where else the colors appear

The same three levels shade the day cards in Section 03 and the relevance column in Section 08. On the district map in Section 01 the alert shading counts published CPD alerts rather than rating anything, and the closure colors mark closure type, not severity.

Disclaimer on the ratings

A rating scores constraint on movement across the metropolitan region. It is not a crime forecast, a safety score for any neighborhood, or advice about any individual, group or community.

Every figure comes from the source named in the end notes, each of them retrieved on 22 September 2026 and held as a snapshot in this repository so that any number here can be regenerated. The weather group was re-pulled at 16:25 CDT before publication, together with the raw gridpoint and the five Lake Michigan marine zones, which that group does not cover.^{10, 11, 13} Nothing was estimated or carried over from a previous edition.

Street closures cover permits filed inside the City of Chicago and no suburb; a permit is a filing, not a street condition. The closure layer and the district table count distinct permits holding a full street closure active at some point in the window; section 04 counts the special-event subset separately.^{2, 3} Filming permits are read from the live filming resource, where the closure column is null on every row and a full closure appears only in the free-text detail or comments, so both fields are read.³⁵ District boundaries were retrieved once and drawn into this page as fixed geometry, so the map loads nothing at page load and works inside the PDF.²¹

Positions are taken from a verified venue list first, then the US Census geocoder, then a calibrated address grid, and permitted events and closures sit on the coordinates their own permit rows carry. The grid is within about 0.12 mi on straight streets and 0.3 to 0.5 mi off on diagonals, so a grid placement is approximate; one item in this edition, a film permit on East River Drive, is placed that way.³⁵ Crowd sizes are not forecast anywhere in this brief. Where a number appears it is a venue maximum published by the operator or the venue’s public owner, and two of the four, Wrigley Field and the United Center, come from a general reference work and are tagged SECONDARY at every use.^{4, 6, 22, 5} Release times are this edition’s own convention, stated in section 03, not a venue’s published end time. WARN entries are flagged by separation date, never by the date the notice was filed.²⁰ Planned gatherings are given by date, district and address and listed as announced rather than assessed; four of the six inside the city exist on a single aggregator that names no organizer, and are marked SINGLE-SOURCE.^{26, 27, 28}

Download the whole edition as a PDF