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.
Amended returns typically take 8-12 weeks for the IRS to process, so you should wait at least 8 weeks before checking on the status of your tax refund. If it has been over 12 weeks since you filed your amendment and you have not received your refund, you should call the IRS at 1-800-829-1040 and speak to a customer service representative.