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MarsBars/iStockBy MEREDITH DELISO, ABC News (NEW YORK) Appointments are being canceled, sites are temporarily closing, county waitlists are in the thousands and states are adjusting eligibility timelines as vaccines supplies dwindle nationwide.With shipments coming weekly, officials say they don't have much visibility on their supplies as they simultaneously schedule first and second doses, and plan to expand vaccination sites."There's a lot of uncertainty right now," Dr. Amesh Adalja, a senior scholar with Johns Hopkins Center for Health Security, told ABC News. "Everybody knows that the supply chain will be coming, but nobody knows exactly when it is coming, how much of it is coming and how steady the supply chain will be. That makes it harder to plan."With its current supply on track to be depleted by the end of this week, and a shipment of over 100,000 Moderna vaccines delayed, the New York City health department will close 15 vaccination hubs from T