A single crane weighs 950 tons, reaches just under 150 feet and costs $6-million. The cranes are used to move containers from ships to the back of a semi-tractor trailer.

It would take an aggressive gust of wind to force the equipment to the ground, but JaxPort officials believe a wind sheer as strong as 60 miles per hour came at the cranes at the right angle.

Severe weather was moving through the northside when a cranes collapsed around 3:30pm. It destroyed a second crane, and damaged at least one more. The debris was as tall as a five-story building.

Jacksonville Fire and Rescue was among the many agencies to response. Finding no one was injured, JaxPort officials and structural engineers have already began their investigation. The clean-up effort could take three-to-five days.

Only the day before this incident, JaxPort and a number of agencies were testing their emergency response plan. Authorities credit the effort for a successful response.

Despite the collapse, JaxPort officials don't expect the incident to slow business at Blount Island.