SpaceX called off a Falcon 9 countdown Wednesday due to the threat of lightning from thunderstorms along Florida’s Space Coast, pushing back the departure of a cargo mission for the International Space Station until Thursday.

The Centaur upper stage launching the Cygnus space freighter Tuesday persevered through a velocity shortfall from the first stage of the Atlas 5 rocket, improvising with a longer firing to reach the correct orbit.

The International Space Station crew releases the Cygnus OA-7 commercial cargo ship from the Canadian robotic arm to begin free-flight away from the lab complex, completing 43-day visit that delivered supplies, food and science gear.