It would have been better CRM if the Captain had said "what are your plans for dealing with the storms ahead?". Many Captains believe that their role is to direct the flight and the FO's actions from start to finish when the FO is PF. The best Captains give the FOs the chance to think for themselves, therefore encouraging/allowing them to learn and develop professionally, intervening only when necessary. If the Captain is directing the action and taking the decisions, the question "who has control" is valid.