As a winter storm starts to drop several inches of snow on the northeast United States, Amazon's advising Prime Now customers in New York City not to rely on its one-hour deliveries. The service started dropping off orders around Manhattan in mid-December, and the online retailer is already seeing a rise in demand as weather conditions get worse. "We're watching the storm also, and will be operating on a limited schedule," Amazon spokeswoman Kelly Cheeseman told Bloomberg. "Customers can get updates through the Prime Now app on delivery availability." So if you're looking to restock a few "everyday essentials," you may want to make other arrangements.