The Siege of Boston, which began in 1775, ended in 1776 when
the Continental army left Boston.
the British allowed supplies to enter Boston.
the British were forced to leave Boston.
the Olive Branch Petition was signed.

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?