SpaceX rocket clouds puzzle early birds on the First Coast

A launch mishap did not cause the corkscrew clouds

What’s that in the sky? News4JAX receives calls, emails after SpaceX rocket launch creates stunning cloud formation (News4JAX)

A strange sight in the sky Wednesday morning caught the attention of many viewers who posted pictures on SnapJax of iridescent clouds shining in the night sky.

The vapor clouds came from a SpaceX rocket that lifted off from Cape Canaveral at 4:34 AM.

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The cloud phenomenon occurs during sunrise or sunset twilight when the night sky is dark at the ground and the high-altitude sunlight illuminates the rockets freezing expanding exhaust particles in the upper atmosphere.

Upper winds spread out the rocket exhaust in different directions as the winds change with height.

Initially, the cloud trail conforms exactly to the path taken by the rocket, but it can eventually be displaced by these air currents resulting in different shapes over time.

Upper winds change direction with height causing the twisting corkscrew cloud configuration.

Sometimes the patterns can linger in the sky for an hour before dispersing depending on the weather patterns.

The SkewT chart shows the direction of winds with height by the barbs on the right. The ticks point to where the wind is coming from either the west at 6.5 miles up or northeast a few hundred feet off the ground.

This launch resulted in clouds farther south compared to summer launches when launch paths aim toward the northeast from Cape Canaveral.

SpaceX considers sea conditions when planning its winter rocket launches and often directs the trajectory of the rocket further south to make it easier for the Falcon 9′s first-stage booster to return smoothly to an offshore drone ship.


About the Author

After covering the weather from every corner of Florida and doing marine research in the Gulf, Mark Collins settled in Jacksonville to forecast weather for The First Coast.

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