Flight Disruptions Now

July 27, 2026

O'Hare and Midway are flagged for morning thunderstorm impacts today as Chicago heads into an SPC Enhanced Risk severe-storm day

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The Storm Prediction Center has posted an Enhanced Risk, Level 3 of 5, for severe thunderstorms across southern Wisconsin, northern Illinois, northern Indiana, southern Michigan and northwestern Ohio today, with Chicago, Milwaukee and Indianapolis inside the risk area and damaging winds, hail and an isolated tornado possible mainly this afternoon and evening, the FAA's current operations plan names O'Hare and Midway for morning thunderstorm impacts with a 6:15 AM ET regional planning discussion, no ground stop or delay program was active at any U.S. airport as of early Monday morning, the FAA's watch list keeps Atlanta and central Florida on tap after 8 AM ET, the New York and Washington metros after noon, Miami and Fort Lauderdale after 2 PM ET and Denver after 5 PM ET, and no carrier has posted a July 27 storm waiver yet.

Chicago heads into a severe-storm morning with nothing live yet

As of early Monday morning, the FAA's operations plan (ADVZY 015, signed 0856Z) showed no active ground stops or delay programs at any airport, and FlightAware's live delay board listed no U.S. airport with an active alert. The day's convective window had not yet opened. What is live is the forecast, and it is stronger than the generic afternoon walls that fizzled through much of July.

The Storm Prediction Center has an Enhanced Risk, Level 3 of 5, for severe thunderstorms today across southern Wisconsin, parts of northern Illinois, northern Indiana, southern Michigan and northwestern Ohio, with Milwaukee, Chicago and Indianapolis inside the risk area, according to WeatherBug (published 2:21 AM ET). A surrounding Slight Risk, Level 2 of 5, reaches Detroit, Columbus, Indianapolis, Louisville, Charleston and Pittsburgh. 21 Alive in Fort Wayne reports the SPC upgraded northeast Indiana and northwest Ohio to Enhanced for Monday as multiple storm rounds are expected to push into the region.

The main threats are damaging wind gusts of 60 to 70 mph, large hail and an isolated tornado, mainly this afternoon and evening. The SPC Day 2 outlook (issued late Sunday) flags a cold front crossing Wisconsin and Lower Michigan Monday afternoon and evening, with 40 to 50 knots of bulk shear supporting initial supercells and then a trend toward bowing clusters. The favored corridor for widespread damaging winds runs from southern Lower Michigan into Indiana and Ohio Monday evening and night, where storms may coalesce into one or more cold-pool-driven MCS complexes, with activity possibly reaching as far south as the Tennessee Valley overnight. MLive flags Monday evening and night as the greatest concern for southern Michigan, and WNEM in Saginaw has declared a First Alert Weather Day with storm waves possible around mid-morning, near lunchtime, and again in the evening.

The FAA's plan puts O'Hare and Midway first. ADVZY 015 states that "ORD and MDW are forecast to see morning thunderstorm impacts, with terminal and route initiatives possible," and schedules a ZAU and C90 regional planning discussion for 1015Z (6:15 AM ET) to work out initial strategies. The terminal constraints line lists thunderstorms at N90, PHL, PCT, ATL, Florida, C90, DTW and Denver, with low ceilings at CLT, SCT, SEA and SFO and wind at Las Vegas.

The honest caveat: this is a forecast, not a live disruption. Every terminal item in the FAA plan sits at the POSSIBLE tier, the lowest confidence level, and no staffing trigger is flagged. The convective walls the FAA has posted on most July mornings have frequently fizzled without firing a single ground stop, as Sunday's Orlando ground stop was one of the few that actually verified. The difference today is the SPC Enhanced Risk sitting directly over Chicago's airspace, which is a higher-confidence meteorological signal than the generic afternoon walls. Whether it verifies is the question the 6:15 AM ET planning discussion and the 7:15 AM ET webinar will start answering.

The FAA's watch list for the rest of Monday

The same operations plan lays out a multi-hub watch that runs from the Chicago morning through the Denver evening, all at POSSIBLE tier:

On the en route side, thunderstorms are flagged across a dozen centers from Boston and New York out to Denver and Albuquerque, with Lake Erie reroutes possible after 6 AM ET, oceanic route closures possible after 8 AM ET, Gulf route closures possible after 10 AM ET, and CDRS, SWAP and capping or tunneling possible across the Florida, Northeast, Denver and Phoenix metros through the afternoon.

One thing the plan does not flag is a staffing trigger. The STAFFING TRIGGER line reads NONE, which separates today from the Newark ground delay program covered last Saturday, where a Philadelphia TRACON Area C staffing shortage, not weather, metered Newark arrivals under clear skies. If a staffing line appears later today, that would be a new and different cause worth a same day update.

Two VIP movement windows are on the board: an Andrews (ADW) departure after 11 AM ET and arrival after 5 PM ET, and a Pontiac (PTK) arrival after 1 PM ET and departure after 4 PM ET. Pontiac sits in the southern Michigan severe risk zone, so a VIP movement there could compound with any afternoon storm activity around Detroit. The next FAA planning webinar is set for 1115Z, 7:15 AM ET, which is the next moment the forecast could sharpen or escalate.

Rebooking and what to watch through the day

No U.S. carrier had posted a July 27 storm waiver as of early Monday morning. Delta's SkyWatch page lists only the Atlanta severe weather advisory covering July 24 to 25 travel (the Friday ground stop) and a Tropical Storm Noul advisory for Hong Kong. The American and United East Coast waivers that ran through late last week covered July 20 to 23 and are now past. Airlines typically post new storm waivers after the late morning FAA planning call firms up the forecast, so the practical move is to check your carrier's travel alert page directly as the day develops: Delta, American, United and Southwest.

If you are booked through Chicago, Detroit, Indianapolis or any Great Lakes or Ohio Valley hub today, a few specifics help. Flying earlier in the day sits ahead of the delay accumulation that compounds through the afternoon, and the SPC puts the main severe threat in the afternoon and evening hours. Building at least 90 minutes into an O'Hare connection insulates you against a ground delay program that holds your inbound aircraft. Before leaving for the airport, check nasstatus.faa.gov for active ground stops and delay programs and your airline's app for live gate information. If your flight is canceled and you decline the rebooking the airline offers, you are entitled to a full cash refund to your original payment method under current DOT rules, not a voucher.

What would trigger a same day update from this feed: a ground stop or ground delay program firing at any watched hub, the 7:15 AM ET webinar sharpening the plan to PROBABLE or EXPECTED tier or adding a staffing trigger, or an airline posting a July 27 storm waiver. If the afternoon and evening MCS clusters materialize over southern Michigan, Indiana and Ohio as the SPC expects, the downstream hubs that will feel it next are the New York and Washington metros (after noon), Miami and Fort Lauderdale (after 2 PM ET) and Denver (after 5 PM ET), in roughly that order.

That’s the reading for this issue.