Visit the check-in desk at your airline and ask the person there how you will be reimbursed. If you are told "you won't be" or "I do not know," then ask to speak to whoever is in charge.
Speak firmly but politely with the person in charge. He will likely tell you that there are no other flights and as of yet there are no vouchers. Give him your flight reference number and phone number and ask him to call you once they have decided what they will do for people whose flights have been cancelled.
Ask an airport employee for a number for you to call for reimbursement. Search the name of your airline online if you aren't at the airport.
Phone customer service with your airline and tell them what flight was cancelled. Depending on what airline you are with, they may give you credit for another flight or a stay in a hotel and food voucher until the weather clears; they may pay for an alternative mode of transportation – or they may do nothing at all.
