SpaceX Postpones Falcon Heavy Launch Due to High Winds

SpaceX's Falcon Heavy rocket, topped with the Arabsat-6A communications satellite, sits on the launch pad on April 10, 2019.
SpaceX's Falcon Heavy rocket, topped with the Arabsat-6A communications satellite, sits on the launch pad on April 10, 2019. (Image credit: SpaceX via Twitter)

SpaceX called off the much-anticipated second launch of its massive Falcon Heavy rocket on Wednesday (April 10) due to unacceptable wind conditions in the upper atmosphere. 

This Falcon Heavy, SpaceX's first to feature the company's upgraded Falcon 9 side boosters, is carrying the commercial communications satellite Arabsat-6A for the Saudi Arabian company Arabsat. It was scheduled to launch from Launch Complex 39A of NASA's Kennedy Space Center in Florida at 8:36 p.m. EDT (0036 April 11 GMT) when SpaceX called off the flight. 

"Standing down from today's Falcon Heavy launch attempt; next opportunity is tomorrow, April 11," SpaceX representatives wrote in a Twitter status update today.

Related: See the Evolution of SpaceX's Rockets in Pictures 

A Thursday launch for Falcon Heavy would occur at 6:35 p.m. EDT (2235 GMT), with weather forecasts currently predicting a 90% chance of good weather, according to the 45th Weather Squadron at Cape Canaveral Air Force Station. 

Those same forecasts, however, also predicted an 80% chance of good conditions for today's launch try, yet SpaceX repeatedly pushed its launch time deeper into a launch window that opened at 6:35 p.m. EDT (2235 GMT) to the weather. 

Earlier, SpaceX founder and CEO Elon Musk cited excessive winds for the delay.

"Upper atmospheric wind shear is very high," Musk wrote less than an hour before SpaceX announced the delay. "Will have to postpone launch unless weather proves soon." 

The launch of Arabsat-6A on a Falcon Heavy will mark the first commercial flight of the rocket, the most powerful booster in use today, and the second mission for the megarocket following a successful test flight in February 2018. During that test flight, which launched Musk's cherry red Tesla Roadster into deep space, Falcon Heavy's twin side boosters returned to Earth to make side-by-side landings on SpaceX pads at Cape Canaveral Air Force Station.

SpaceX hopes to repeat that dual landing with the Arabsat-6A, and then do one better by landing the rocket's massive center core stage on an offshore droneship in the Atlantic Ocean. During the 2018 test flight, the center core stage missed its landing when two of the engines ran out of igniter fuel during a maneuver. 

SpaceX had initially hoped to launch Falcon Heavy's Arabsat-6A mission by the end of 2018, but ultimately pushed it into 2019. The company also plans to use the megarocket to launch more than two dozen satellites for the U.S. military as part of the Space Test Program-2 launch. 

The U.S. Air Force has also awarded SpaceX a $130 million contract to launch the classified Air Force Space Command-52 satellite (AFSPC-52) late in the 2020 fiscal year.

You can watch the Falcon Heavy launch Thursday here and on's homepage, courtesy of SpaceX, beginning about 20 minutes before liftoff. You can also watch the launch directly from SpaceX's website here.

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Tariq Malik

Tariq is the Editor-in-Chief of and joined the team in 2001, first as an intern and staff writer, and later as an editor. He covers human spaceflight, exploration and space science, as well as skywatching and entertainment. He became's Managing Editor in 2009 and Editor-in-Chief in 2019. Before joining, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. In October 2022, Tariq received the Harry Kolcum Award for excellence in space reporting from the National Space Club Florida Committee. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. You can find Tariq at and as the co-host to the This Week In Space podcast with space historian Rod Pyle on the TWiT network. To see his latest project, you can follow Tariq on Twitter @tariqjmalik.