A mild snowstorm. A winter storm is an event in which varieties of precipitation are formed that only occur at low temperatures, such as snow or sleet, or a rainstorm where ground temperatures are low enough to allow ice to form (i.e. freezing rain).
Federal amendments are generally due within three years from the date the return is originally due. The tax year and due date are a little confusing to understand, so the easiest way to think of due dates is to add one year to the tax year you want to amend.
How long does an amended tax return take to process? Normal processing time for Forms 1040X is 8 to 12 weeks from the IRS receipt date. Also, make sure to append the signature and the date.