The foul weather, which one Russian space agency official described simply as "horrible," means NASA astronaut Kevin Ford and cosmonauts Oleg Novitskiy and Evgeny Tarelkin had to delay theirfor at least 24 hours. The three men have been living in space for 141 days and were preparing to enter their Soyuz spacecraft for a landing on the frigid steppes of Kazakhstan tonight.
"We are waving off landing," NASA spokesperson Rob Navias said during live mission commentary. "No Soyuz landing tonight."
The rain and fog in Kazakhstan is not a threat to the Soyuz spacecraft and crew, Navias said. But the recovery helicopters essential for retrieving the astronauts after landing would not be able to make it to their staging grounds for the landing because of bad weather conditions. 
"I talked to our colleagues in Kazakhstan last night and the weather is really horrible, and a decision was made not to risk, and we suggest that we delay the landing." chief Russian flight director Vlademir Solovyev said through a translator on NASA TV.
Ford, Novitskiy and Tarelkin were originally scheduled to undock their Russian-built Soyuz TMA-06M spacecraft at thetonight at 8:30 p.m. EDT (0030 GMT), with an expected landing of 11:56 p.m. EDT (0356 GMT).
Landing is now scheduled to occur on Friday (March 15) at 11:06 p.m. EDT (0206 March 16 GMT), NASA officials said.
This is not the first time weather has affected a Soyuz spacecraft's landing. In 2009, another Soyuz craft had its return to Earth delayed by a day because snowy conditions on the ground made the landing potentially unsafe.
Ford, Novitskiy and Tarelkin have spent nearly five months on board the station. The mission is Ford's second spaceflight and the first trip to space for Novitskiy and Tarelkin.
When Ford and his two crewmates depart the station, three other spaceflyers , Russian Roman Romanenko and American Tom Marshburn will remain aboard orbiting lab to await a new set of crewmembers.
That new crew will launch on March 28 to ferry cosmonauts Pavel Vinogradov, Alexander Misurkin and NASA astronaut Chris Cassidy to the space station.
NASA has relied on Russia's Soyuz crafts ferry astronauts between the Earth's surface and orbit since the retirement of the agency's shuttle program in 2011. Officials with the space agency hope to instead depend on privately built unmanned and crewed spacecraft to bring people and cargo to and from the space station.
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