Thunderstorms in December

11am UPDATE: Don't be too surprised if you hear the rumble of thunder today. Some decent thunderstorms have developed along the arctic boundary that is slipping across Ontario and New York. Very strong winds are developing ahead of the front. To show you how dynamic this front is, parts of Oklahoma yesterday went from 27C down to 0C (80 to 32F) in just a few hours. Today it is plus 11C in Toronto at 11am and -20C in Thunder Bay. Windsor is already down to 2C with 60km/h winds. Be prepared for damaging winds today and dropping temperatures in Ontario and Quebec.