July 18, 2026

Reagan, Dulles, and BWI went into ground stops as the Northeast wall stretched to twelve airports from Boston to Washington

The morning wall that fired three hours early has gone full-scale. As of the FAA's latest operations plan, issued shortly after 1:24 PM ET, twelve airports from Boston to Washington are in ground stops until 2:30 to 3:30 PM, six airports are in ground-delay programs running into the evening and overnight, Teterboro is averaging over three hours, and the DC metros went active ahead of the 2 PM window the FAA had planned. The NWS puts the worst of the severe storms at 4 to 8 PM ET, so this is still the leading edge.

The DC metros finally fired, hours after the 8:30 AM slot fizzled

The FAA's operations plan (ADVZY 165) says ground stops to IAD and DCA were issued "due to lack of arrival routes," and BWI went into a ground stop at 1:12 PM ET (ADVZY 160, 482 flights affected, averaging 80 minutes, cause "lack of routes"). All three run until 3:30 PM ET. The DCA ground stop the FAA had flagged as most likely for 8:30 AM ET fizzled again this morning, then fired anyway in the early afternoon, the same early-firing pattern as the morning wall that went live before 10:30 AM instead of the planned 2 PM. The DC metros are the freshest addition to a wall that until this morning was concentrated on New York and Philadelphia.

Twelve airports are in ground stops, and Teterboro is averaging over three hours

The full ground-stop list as of the latest plan: Boston and Bradley (until 2:30 PM ET), LaGuardia, Newark, JFK, Teterboro, Westchester, Morristown, and Caldwell (all until 3 PM), and BWI, Dulles, and Reagan (all until 3:30 PM). Teterboro is the worst of them: ADVZY 145 shows 6,315 flights affected, a 319-minute max, and a 186-minute average, with the FAA noting the stop "will likely continue after 1900Z" (3 PM ET) and the scope may be revised. JFK now runs both a ground stop and a ground-delay program at the same time. The New York satellite airports (Westchester, Morristown, Caldwell, Bradley) are inside the same wall as the majors, so the region's relief airports are not a workaround today.

Six ground-delay programs run into the evening and overnight

Behind the ground stops, six GDPs are metering arrivals for hours: LaGuardia to 7:59 PM ET, Teterboro to 8:59 PM, JFK and Philadelphia each to 10:59 PM, Boston to 11:59 PM, and Newark to 12:59 AM ET Sunday. Philadelphia's program is compounded by wildfire smoke still dropping visibility, the FAA lists PHL and PCT under "low vis/smoke" terminal constraints, so even when the thunderstorms clear, the smoke floor remains. Boston's GDP is new since this morning's issue, which covered only the New York and Philadelphia programs. FlightAware is tracking 8,184 U.S. delays and 250 U.S. cancellations, up from 2,236 delays at 10:44 AM.

Why: an Enhanced Risk day with the peak still ahead

The NWS Mount Holly briefing rates the Northeast at an Enhanced Risk, level 3 of 5, for damaging winds, a few tornadoes, large hail, and flash flooding at 2 to 3 inches per hour. NYC Emergency Management via Gothamist puts the wind threat at 50 to 70 mph, and The Watchers notes an EF2 tornado is possible in southeast Pennsylvania, New Jersey, and southern New York. The Storm Prediction Center expects multiple rounds from 10 AM through midnight, with the worst at 4 to 8 PM ET. A Flash Flood Watch runs 10 AM Saturday through 2 AM Sunday along and northwest of I-95. The ground stops firing at 1 PM are the leading edge, not the peak.

What's next: Chicago, Atlanta, and Florida are still in the plan

The FAA's terminal planned list still has ORD/MDW and ATL ground stop or delay programs possible through 6 PM ET, FLL/MIA/RSW possible through 8 PM, CLT possible through 8 PM, and TPA/MCO possible through 10 PM. That tracks the NWS window, which shifts the severe risk toward the Carolinas and Florida overnight. Atlanta is Delta's home hub and has taken ground stops on three of the last ten days (July 9, 11, and 12) plus arrival delays on two more, so the 3 PM ET ATL window is the one to watch for network-wide cascade. A Connecticut timeline from the New Haven Register frames a first round near 3 PM and a second round near 9 PM before the cold front clears the region around midnight.

Rebooking: the NYC waiver window and where to check

Delta's NYC thunderstorm waiver covers EWR, HPN, JFK, and LGA for travel July 16 to 18 with rebooking through July 21, and is the most relevant active waiver for today's Northeast disruption. United, American, and JetBlue have not posted a new Saturday-specific waiver as of this check, but waivers typically appear a few hours after the FAA's morning planning call, so re-check your carrier's travel-alerts page directly: American, United, JetBlue. The FAA NAS Status page and the ATCSCC advisory list are the primary sources for whether your airport's ground stop has been extended or lifted. If you are connecting through the Northeast today, build extra time or push the trip to Sunday, when the cold front clears and the air quality should improve.

Tracking: staffing and smoke underneath the weather

Two compounding factors run underneath the convective weather. Staffing triggers are active for D10 Dallas TRACON until 3 PM ET, ZAB East Area until 5 PM ET (which pulled DFW_VKTRY and DFW_NO_DOGS_HEAD route restrictions into the plan), and PHL Area C after 7 PM ET. The ZNY Area A and E staffing triggers that were active this morning timed out at 1 PM. Canadian wildfire smoke continues to hold Philadelphia and PCT under low-visibility constraints, a fifth straight day of Code Red or worse air quality across DC, Baltimore, and Philadelphia per Travelers Today, though the cold front expected tonight should finally push the smoke out of the Mid-Atlantic corridor.