The first formal crewed mission to the International Space Station using a SpaceX Crew Dragon capsule and Falcon 9 rocket was a historic achievement for both NASA and SpaceX. The four-astronaut roster that made the trip from Earth to the orbiting laboratory arrived on November 16th of 2020, which means that as it’s the end of April 2021, it’s time to come home and make room for the next ISS expedition to get underway. Unfortunately, despite a planned return on April 28th, the crew is still in space, and as of right now there is no official date for them to come back.

The crew was first scheduled to depart the ISS on April 28th and once it became apparent that that date wouldn’t work, the space agency opted for April 30th instead. That plan was canceled as well. So, what kind of incredible, all-powerful force could keep NASA from bringing its astronauts home? Mother Nature, of course!

According to releases from NASA, the weather off of the coast of Florida where the recovery of the capsule was supposed to take place is not ideal. It’s remained poor for several days, and pushing the departure date back by two days didn’t allow enough time for the weather system to clear out and make way for sunny skies. The crew gets at least a few extra days in space, but it’s still unclear exactly when they’ll be coming home.