FAA issues major ground stop at Denver after severe hail and high winds

The Federal Aviation Administration halted flights headed to Denver International Airport on May 21 after high winds and thunderstorms moved across the Front Range, disrupting operations at one of the country’s busiest airports. Local outlet KRDO reported the ground stop was issued late Thursday afternoon and was initially set to last until 6:30 p.m. Mountain time, with the FAA warning there was a 30% to 60% chance it would be extended. CBS Colorado later reported the stop lasted until about 9 p.m. as storms continued in the area. Denver’s weather setup was consistent with the disruption. The National Weather Service office in Boulder said in its May 23 forecast discussion that wind and hail were the primary severe-storm hazards in northeast Colorado and that gusts of 35 to 40 mph were possible from showers moving off the terrain. TheTravel, citing FlightAware data, said severe winds and thunderstorms on Colorado’s Eastern Plains contributed to the Denver delays and described reports of golf-ball-sized hail. (krdo.com) ### How big was the disruption at Denver? Flight-tracking figures cited by multiple outlets put the scale in the hundreds of delayed flights. TheTravel reported roughly 800 delayed flights at Denver on Thursday, including about 445 departures and 362 arrivals, with United accounting for 230 of those delays and only one United cancellation. CBS Colorado said around 900 flights were delayed during the nearly four-hour ground stop. A Denver Post report, mirrored by other aggregators, said more than 700 flights were delayed after the three-hour stop. (forecast.weather.gov) United was hit hardest because Denver is one of its largest hubs. TheTravel said United accounted for about 31% of its Denver flights being delayed during the disruption. That tracks with Denver’s role in United’s domestic network, where even a short ground stop can spill into evening arrivals, aircraft rotations and next-day departures. That last point is an inference based on hub operations rather than a direct FAA statement. (thetravel.com) ### What does a ground stop actually mean for passengers? A ground stop means flights bound for the affected airport are temporarily held at their departure airports rather than being allowed to take off into a bottleneck. CBS Colorado reported the May 21 order applied to departures to Denver from several air traffic control centers, including ZLA, ZLC, ZDV, ZKC, ZAB and ZMP. The FAA’s airport status page now shows Denver operating normally, with only short gate-hold, taxi and arrival delays as of the latest update available through that system. (thetravel.com) For passengers, that usually shows up as late inbound aircraft first, then missed connections, rolling departure delays and occasional cancellations if crews or planes time out. United’s flight-status page says travelers should continue to check the status of individual flights because operating conditions can change quickly and a flight listed as delayed may still depart near its scheduled time. (cbsnews.com) ### Why was Denver especially vulnerable to this storm line? Denver International sits on the plains east of the city, where spring and early-summer storms can bring abrupt wind shifts, hail and lightning that complicate ramp and runway operations. The National Weather Service said the main hazards in the May 23 setup were hail and wind, and local reporting on the May 21 event described thunderstorms and strong winds moving through the area during the evening push. (united.com) A three- to four-hour stoppage late in the day matters because Denver handles a heavy bank of arrivals and departures in the evening. The FAA’s real-time airport status system is the main public source for whether a ground stop has ended, while airline sites show the effect on specific flights. ### Where should travelers look next? The FAA’s Denver airport status page remains the clearest source for current delay programs and general airport conditions, while United and other carriers publish flight-specific updates on their own status pages. (forecast.weather.gov) Denver International Airport also maintains live arrivals and departures pages for gate and schedule changes. As of the latest FAA status update available through the public system, Denver was no longer under a ground stop and was reporting only minimal general delays. (fly.faa.gov)