Wht dating system was created in the 16th century, divided dates into the categories using bc and ad, and was used by most people in the western parts of the world use

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?