BBC: Poor weather conditions could hamper a record-breaking attempt to cross the Pacific Ocean using a solar-powered plane.
The Solar Impulse craft is a day into what was expected to be a 130-hour journey from China to Hawaii.
However, meteorologists say the forecast is worsening.
They have asked the pilot to stay in a holding pattern while they decide whether he should continue or turn back towards land.
They will reassess the situation at a team briefing at 08:00 GMT Monday.
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