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.
Be aware: Your state tax liability may be affected by changes on your federal return. For information on how to correct your state return, contact your state tax agency. The normal processing time for an IRS Form 1040X, Amended U.S. Individual Income Tax Return is between 8 and 12 weeks from the IRS receipt date.