Some NWS forecast offices, such as the one serving the Des Moines, Iowa metropolitan area, have created standardized criteria and purpose for the usages of the heightened wording. Because data about the tornado and its exact path are often ascertained after the initial tornado warning is issued, this designation is usually added to the Severe Weather Statement (SAME code: SVS) that is used to follow up a tornado warning.
Certain NWS forecast offices, such as the one serving the Des Moines, Iowa metropolitan area, have established standardized criteria and objectives for the usage of intensified language. Due to data about the tornado and its precise course often being determined after the initial tornado warning is issued, this designation is typically added to the Severe Weather Statement (SAME code: SVS) that follows up a tornado warning.