This year's polar vortex brings a whole new focus on weather and its impact on the overall economy.Every speechwriter in Washington, DC who has put pen to paper about agricultural policy has certainly used the above title as a phrase about the risks inherent in farming, a business that is indeed subject to the vagaries of weather. In recent years, we've had planting deterred by spring flooding, livestock loss resulting from snow and drought, poultry issues due to the cold temperatures and high propane costs as well as record crop prices and petitions to waive the renewable fuel standards also because of drought.This year's polar vortex brings a whole new focus on weather and its impact on the overall economy. In addition to record cold in t...